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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../compiler.html" > Inform7< / a > < / li > < li > < a href = "index.html" > if< / a > < / li > < li > < a href = "index.html#4" > Chapter 4: Actions< / a > < / li > < li > < b > Action Conditions< / b > < / li > < / ul > < / div >
< p class = "purpose" > A special condition for testing against action patterns.< / p >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. < / b > The actions plugin introduces a special form of condition: authors can
write "if taking or dropping something", for example, and this is implicitly
a test of what the current action is.
< / p >
< p class = "commentary" > This is represented in the parse tree as the twig:
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > TEST_VALUE_NT< / span >
< span class = "plain-syntax" > CONSTANT_NT< / span >
< / pre >
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< p class = "commentary" > where the constant below is the action seen as a noun — linguistically, a
"gerund". It will always have the kind < span class = "extract" > < span class = "extract-syntax" > K_stored_action< / span > < / span > or < span class = "extract" > < span class = "extract-syntax" > K_description_of_action< / span > < / span > ,
depending on whether the test is against an explicit action or something vaguer.
< / p >
< p class = "commentary" > Here we create and test for such twigs:
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
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< span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > AConditions::new_action_TEST_VALUE< / 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" > AConditions::new_action_TEST_VALUE< / span > < / span > :< br / > Parse Action Patterns - < a href = "4-pap.html#SP6" > § 6< / a > , < a href = "4-pap.html#SP7" > § 7< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > action_pattern< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wording< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > W< / 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" > ap< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "null action pattern"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Node::new_with_words< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > TEST_VALUE_NT< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > down< / span > < span class = "plain-syntax" > = < / span > < a href = "4-ak.html#SP5" class = "function-link" > < span class = "function-syntax" > ARvalues::from_action_pattern< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Node::set_text< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > down< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > AConditions::new_past_action_TEST_VALUE< / span > < button class = "popup" onclick = "togglePopup('usagePopup2')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup2" > Usage of < span class = "code-font" > < span class = "function-syntax" > AConditions::new_past_action_TEST_VALUE< / span > < / span > :< br / > Parse Action Patterns - < a href = "4-pap.html#SP7" > § 7< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > action_pattern< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > wording< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > = < / span > < a href = "4-ac.html#SP1" class = "function-link" > < span class = "function-syntax" > AConditions::new_action_TEST_VALUE< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > W< / 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 > < a href = "4-ap2.html#SP9" class = "function-link" > < span class = "function-syntax" > ActionPatterns::makes_callings< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ap< / 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 > < span class = "identifier-syntax" > Task::syntax_tree< / span > < span class = "plain-syntax" > (), < / span > < span class = "identifier-syntax" > _p_< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > PM_PastActionCalled< / span > < span class = "plain-syntax" > ),< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "a description of an action cannot both refer to past history and also "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "use '(called ...)'"< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "because that would require Inform in general to remember too much "< / span >
< span class = "plain-syntax" > < / span > < span class = "string-syntax" > "information about past events."< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > } < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Conditions::attach_tense< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > HASBEEN_TENSE< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > AConditions::is_action_TEST_VALUE< / span > < button class = "popup" onclick = "togglePopup('usagePopup3')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup3" > Usage of < span class = "code-font" > < span class = "function-syntax" > AConditions::is_action_TEST_VALUE< / span > < / span > :< br / > < a href = "4-ac.html#SP2" > § 2< / a > , < a href = "4-ac.html#SP3" > § 3< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > spec< / 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" > Node::is< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > TEST_VALUE_NT< / span > < span class = "plain-syntax" > )) & & < / span >
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< span class = "plain-syntax" > ((< / span > < a href = "4-ak.html#SP5" class = "function-link" > < span class = "function-syntax" > ARvalues::to_action_pattern< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > down< / span > < span class = "plain-syntax" > )) ||< / span >
< span class = "plain-syntax" > (< / span > < a href = "4-ak.html#SP5" class = "function-link" > < span class = "function-syntax" > ARvalues::to_explicit_action< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > down< / span > < 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" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. < / b > As noted above, the gerund is just the child node, and from that we can
reconstruct the original action pattern which led to this condition:
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > AConditions::gerund_from_TEST_VALUE< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > spec< / 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 > < a href = "4-ac.html#SP1" class = "function-link" > < span class = "function-syntax" > AConditions::is_action_TEST_VALUE< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spec< / 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" > internal_error< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "gerund improperly extracted"< / 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" > spec< / span > < span class = "plain-syntax" > -> < / span > < span class = "identifier-syntax" > down< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > action_pattern< / span > < span class = "plain-syntax" > *< / span > < span class = "function-syntax" > AConditions::pattern_from_action_TEST_VALUE< / span > < button class = "popup" onclick = "togglePopup('usagePopup4')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup4" > Usage of < span class = "code-font" > < span class = "function-syntax" > AConditions::pattern_from_action_TEST_VALUE< / span > < / span > :< br / > < a href = "4-ac.html#SP3" > § 3< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > spec< / 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 > < a href = "4-ac.html#SP1" class = "function-link" > < span class = "function-syntax" > AConditions::is_action_TEST_VALUE< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > )) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > gerund< / span > < span class = "plain-syntax" > = < / span > < a href = "4-ac.html#SP2" class = "function-link" > < span class = "function-syntax" > AConditions::gerund_from_TEST_VALUE< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > );< / span >
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< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > action_pattern< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > = < / span > < a href = "4-ak.html#SP5" class = "function-link" > < span class = "function-syntax" > ARvalues::to_action_pattern< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gerund< / 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" > ap< / span > < span class = "plain-syntax" > == < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > explicit_action< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > ea< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Node::get_constant_explicit_action< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > gerund< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > ea< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > ea< / span > < span class = "plain-syntax" > -> < / span > < span class = "element-syntax" > as_described< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > return< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > NULL< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< / pre >
< p class = "commentary firstcommentary" > < a id = "SP3" class = "paragraph-anchor" > < / a > < b > § 3. < / b > Which we can then compile a test against:
< / p >
< 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" > AConditions::compile_condition< / span > < button class = "popup" onclick = "togglePopup('usagePopup5')" > < span class = "comment-syntax" > ?< / span > < span class = "popuptext" id = "usagePopup5" > Usage of < span class = "code-font" > < span class = "function-syntax" > AConditions::compile_condition< / span > < / span > :< br / > Actions Plugin - < a href = "4-ap.html#SP1" > § 1< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > value_holster< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > VH< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > parse_node< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > spec< / 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 > < a href = "4-ac.html#SP1" class = "function-link" > < span class = "function-syntax" > AConditions::is_action_TEST_VALUE< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > )) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > action_pattern< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > = < / span > < a href = "4-ac.html#SP2" class = "function-link" > < span class = "function-syntax" > AConditions::pattern_from_action_TEST_VALUE< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > spec< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > RTActionPatterns::compile_pattern_match< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > VH< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > ap< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > FALSE< / span > < span class = "plain-syntax" > );< / span >
< 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 >
< span class = "plain-syntax" > }< / span >
< 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 >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< ul class = "progressbar" > < li class = "progressprev" > < a href = "4-ak.html" > ❮ < / a > < / li > < li class = "progresschapter" > < a href = "P-wtmd.html" > P< / a > < / li > < li class = "progresschapter" > < a href = "1-im.html" > 1< / a > < / li > < li class = "progresschapter" > < a href = "2-bd.html" > 2< / a > < / li > < li class = "progresschapter" > < a href = "3-sm.html" > 3< / a > < / li > < li class = "progresscurrentchapter" > 4< / li > < li class = "progresssection" > < a href = "4-ap.html" > ap< / a > < / li > < li class = "progresssection" > < a href = "4-anaa.html" > anaa< / a > < / li > < li class = "progresssection" > < a href = "4-ak.html" > ak< / a > < / li > < li class = "progresscurrent" > ac< / li > < li class = "progresssection" > < a href = "4-act.html" > act< / a > < / li > < li class = "progresssection" > < a href = "4-as.html" > as< / a > < / li > < li class = "progresssection" > < a href = "4-av.html" > av< / a > < / li > < li class = "progresssection" > < a href = "4-ann.html" > ann< / a > < / li > < li class = "progresssection" > < a href = "4-ap2.html" > ap2< / a > < / li > < li class = "progresssection" > < a href = "4-anl.html" > anl< / a > < / li > < li class = "progresssection" > < a href = "4-apc.html" > apc< / a > < / li > < li class = "progresssection" > < a href = "4-pap.html" > pap< / a > < / li > < li class = "progresssection" > < a href = "4-pc.html" > pc< / a > < / li > < li class = "progresssection" > < a href = "4-ea.html" > ea< / a > < / li > < li class = "progresssection" > < a href = "4-nap.html" > nap< / a > < / li > < li class = "progresssection" > < a href = "4-gng.html" > gng< / a > < / li > < li class = "progresschapter" > < a href = "5-pp.html" > 5< / a > < / li > < li class = "progressnext" > < a href = "4-act.html" > ❯ < / a > < / li > < / ul > < / div >
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