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<!--Weave of 'Explicit Relations' generated by Inweb-->
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<div class="breadcrumbs">
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<ul class="crumbs"><li><a href="../index.html">Home</a></li><li><a href="../compiler.html">Inform7 Modules</a></li><li><a href="index.html">core</a></li><li><a href="index.html#7">Chapter 7: Verbs</a></li><li><b>Explicit Relations</b></li></ul></div>
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<p class="purpose">To draw inferences from the relations created explicitly by the source text.</p>
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<ul class="toc"><li><a href="7-er.html#SP1">§1. Managing the BPs generated</a></li></ul><hr class="tocbar">
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<p class="commentary firstcommentary"><a id="SP1" class="paragraph-anchor"></a><b>§1. Managing the BPs generated. </b>The relations created in this section belong to the <span class="extract"><span class="extract-syntax">EXPLICIT_KBP</span></span> family,
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named so because their definitions are explicit in the source text. Initially,
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there are none.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Relations::Explicit::REL_create_initial_stock</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax">}</span>
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Relations::Explicit::REL_create_second_stock</span><span class="plain-syntax">(</span><span class="reserved-syntax">void</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP2" class="paragraph-anchor"></a><b>§2. </b>They typecheck by the default rule only:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Relations::Explicit::REL_typecheck</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">bp</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> **</span><span class="identifier-syntax">kinds_of_terms</span><span class="plain-syntax">, </span><span class="identifier-syntax">kind</span><span class="plain-syntax"> **</span><span class="identifier-syntax">kinds_required</span><span class="plain-syntax">, </span><span class="reserved-syntax">tc_problem_kit</span><span class="plain-syntax"> *</span><span class="identifier-syntax">tck</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">DECLINE_TO_MATCH</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3" class="paragraph-anchor"></a><b>§3. </b>They are asserted thus. Note that if we have a symmetric relation then we need
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to behave as if \(B(y, x)\) had also been asserted whenever \(B(x, y)\) has, if
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\(x\neq y\).
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Relations::Explicit::REL_assert</span><span class="plain-syntax">(</span><span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">bp</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs0</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec0</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs1</span><span class="plain-syntax">, </span><span class="identifier-syntax">parse_node</span><span class="plain-syntax"> *</span><span class="identifier-syntax">spec1</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="named-paragraph-container code-font"><a href="7-er.html#SP3_1" class="named-paragraph-link"><span class="named-paragraph">Reject non-assertable relations</span><span class="named-paragraph-number">3.1</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">BinaryPredicates::store_dynamically</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><a href="16-in.html#SP8" class="function-link"><span class="function-syntax">World::Inferences::draw_relation_spec</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">, </span><span class="identifier-syntax">spec0</span><span class="plain-syntax">, </span><span class="identifier-syntax">spec1</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> } </span><span class="reserved-syntax">else</span><span class="plain-syntax"> {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">infs0</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">) || (</span><span class="identifier-syntax">infs1</span><span class="plain-syntax"> == </span><span class="identifier-syntax">NULL</span><span class="plain-syntax">)) </span><span class="named-paragraph-container code-font"><a href="7-er.html#SP3_2" class="named-paragraph-link"><span class="named-paragraph">Reject relationship with nothing</span><span class="named-paragraph-number">3.2</span></a></span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">BinaryPredicates::allow_arbitrary_assertions</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><a href="16-in.html#SP8" class="function-link"><span class="function-syntax">World::Inferences::draw_relation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs0</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs1</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">BinaryPredicates::get_form_of_relation</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">) == </span><span class="identifier-syntax">Relation_Sym_VtoV</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">infs0</span><span class="plain-syntax"> != </span><span class="identifier-syntax">infs1</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><a href="16-in.html#SP8" class="function-link"><span class="function-syntax">World::Inferences::draw_relation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs1</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs0</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">BinaryPredicates::is_explicit_with_runtime_storage</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">)) {</span>
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<span class="plain-syntax"> </span><a href="7-er.html#SP4" class="function-link"><span class="function-syntax">Relations::Explicit::infer_property_based_relation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs1</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs0</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> ((</span><span class="identifier-syntax">BinaryPredicates::get_form_of_relation</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">) == </span><span class="identifier-syntax">Relation_Sym_OtoO</span><span class="plain-syntax">) && (</span><span class="identifier-syntax">infs0</span><span class="plain-syntax"> != </span><span class="identifier-syntax">infs1</span><span class="plain-syntax">))</span>
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<span class="plain-syntax"> </span><a href="7-er.html#SP4" class="function-link"><span class="function-syntax">Relations::Explicit::infer_property_based_relation</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs0</span><span class="plain-syntax">, </span><span class="identifier-syntax">infs1</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP3_1" class="paragraph-anchor"></a><b>§3.1. </b>This is the point at which non-assertable relations are thrown out.
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</p>
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<p class="commentary"><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Reject non-assertable relations</span><span class="named-paragraph-number">3.1</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">BinaryPredicates::can_be_made_true_at_runtime</span><span class="plain-syntax">(</span><span class="identifier-syntax">bp</span><span class="plain-syntax">) == </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_Unassertable2</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"the relationship you describe is not exact enough"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"so that I do not know how to make this assertion come true. "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"For instance, saying 'The Study is adjacent to the Hallway.' "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"is not good enough because I need to know in what direction: "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"is it east of the Hallway, perhaps, or west?"</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="7-er.html#SP3">§3</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP3_2" class="paragraph-anchor"></a><b>§3.2. </b><span class="named-paragraph-container code-font"><span class="named-paragraph-defn">Reject relationship with nothing</span><span class="named-paragraph-number">3.2</span></span><span class="comment-syntax"> =</span>
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="plain-syntax"> </span><span class="identifier-syntax">StandardProblems::sentence_problem</span><span class="plain-syntax">(</span><a href="1-wtc.html#SP6" class="function-link"><span class="function-syntax">Task::syntax_tree</span></a><span class="plain-syntax">(), </span><span class="identifier-syntax">_p_</span><span class="plain-syntax">(</span><span class="identifier-syntax">PM_CantRelateNothing</span><span class="plain-syntax">),</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"the relationship you describe seems to be with nothing"</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"which does not really make sense. 'Nothing' looks like a noun, "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"but really Inform uses it to mean the absence of one, so it's "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"against the rules to say something like 'Mr Cogito disputes nothing' "</span>
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<span class="plain-syntax"> </span><span class="string-syntax">"to try to put 'Mr Cogito' and 'nothing' into a relationship."</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">TRUE</span><span class="plain-syntax">;</span>
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</pre>
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<ul class="endnotetexts"><li>This code is used in <a href="7-er.html#SP3">§3</a>.</li></ul>
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<p class="commentary firstcommentary"><a id="SP4" class="paragraph-anchor"></a><b>§4. </b>This routine converts the knowledge that \(R(ox, oy)\) into a single
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inference. It can only be used for a simple subclass of the relations:
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those which store <span class="extract"><span class="extract-syntax">oy</span></span>, the only thing related to <span class="extract"><span class="extract-syntax">ox</span></span>, in a given property
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of <span class="extract"><span class="extract-syntax">ox</span></span>. The beauty of this is that the "only thing related to" business
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is then enforced by the inference mechanism, since an attempt to assert
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both \(R(x,y)\) and \(R(x,z)\) will result in contradictory property value
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inferences for \(y\) and \(z\).
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">void</span><span class="plain-syntax"> </span><span class="function-syntax">Relations::Explicit::infer_property_based_relation</span><button class="popup" onclick="togglePopup('usagePopup1')"><span class="comment-syntax">?</span><span class="popuptext" id="usagePopup1">Usage of <span class="code-font"><span class="function-syntax">Relations::Explicit::infer_property_based_relation</span></span>:<br/><a href="7-er.html#SP3">§3</a></span></button><span class="plain-syntax">(</span><span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">relation</span><span class="plain-syntax">,</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs0</span><span class="plain-syntax">, </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">infs1</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">if</span><span class="plain-syntax"> (</span><span class="identifier-syntax">BinaryPredicates::get_form_of_relation</span><span class="plain-syntax">(</span><span class="identifier-syntax">relation</span><span class="plain-syntax">) == </span><span class="identifier-syntax">Relation_VtoO</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">inference_subject</span><span class="plain-syntax"> *</span><span class="identifier-syntax">swap</span><span class="plain-syntax">=</span><span class="identifier-syntax">infs0</span><span class="plain-syntax">; </span><span class="identifier-syntax">infs0</span><span class="plain-syntax">=</span><span class="identifier-syntax">infs1</span><span class="plain-syntax">; </span><span class="identifier-syntax">infs1</span><span class="plain-syntax">=</span><span class="identifier-syntax">swap</span><span class="plain-syntax">;</span>
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<span class="plain-syntax"> }</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">property</span><span class="plain-syntax"> *</span><span class="identifier-syntax">prn</span><span class="plain-syntax"> = </span><span class="identifier-syntax">BinaryPredicates::get_i6_storage_property</span><span class="plain-syntax">(</span><span class="identifier-syntax">relation</span><span class="plain-syntax">);</span>
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<span class="plain-syntax"> </span><a href="16-in.html#SP8" class="function-link"><span class="function-syntax">World::Inferences::draw_property</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs0</span><span class="plain-syntax">, </span><span class="identifier-syntax">prn</span><span class="plain-syntax">, </span><a href="16-is.html#SP17" class="function-link"><span class="function-syntax">InferenceSubjects::as_constant</span></a><span class="plain-syntax">(</span><span class="identifier-syntax">infs1</span><span class="plain-syntax">));</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP5" class="paragraph-anchor"></a><b>§5. </b>We need do nothing special: these relations can be compiled from their schemas.
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Relations::Explicit::REL_compile</span><span class="plain-syntax">(</span><span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="identifier-syntax">task</span><span class="plain-syntax">, </span><span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">bp</span><span class="plain-syntax">, </span><span class="reserved-syntax">annotated_i6_schema</span><span class="plain-syntax"> *</span><span class="identifier-syntax">asch</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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<p class="commentary firstcommentary"><a id="SP6" class="paragraph-anchor"></a><b>§6. </b>Problem message text:
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</p>
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<pre class="displayed-code all-displayed-code code-font">
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<span class="reserved-syntax">int</span><span class="plain-syntax"> </span><span class="function-syntax">Relations::Explicit::REL_describe_for_problems</span><span class="plain-syntax">(</span><span class="identifier-syntax">OUTPUT_STREAM</span><span class="plain-syntax">, </span><span class="identifier-syntax">binary_predicate</span><span class="plain-syntax"> *</span><span class="identifier-syntax">bp</span><span class="plain-syntax">) {</span>
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<span class="plain-syntax"> </span><span class="reserved-syntax">return</span><span class="plain-syntax"> </span><span class="identifier-syntax">FALSE</span><span class="plain-syntax">;</span>
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<span class="plain-syntax">}</span>
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</pre>
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