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<!-- Weave of 'Identifiers' generated by Inweb -->
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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "../services.html" > Services< / a > < / li > < li > < a href = "index.html" > words< / a > < / li > < li > < a href = "index.html#3" > Chapter 3: Words in Sequence< / a > < / li > < li > < b > Identifiers< / b > < / li > < / ul > < / div >
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< p class = "purpose" > To summarise wordings into alphanumeric identifiers of the kind used by standard programming languages.< / p >
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< ul class = "toc" > < li > < a href = "3-idn.html#SP1" > § 1. Validity of identifiers< / a > < / li > < li > < a href = "3-idn.html#SP3" > § 3. Automatically composed identifiers< / a > < / li > < / ul > < hr class = "tocbar" >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. Validity of identifiers. < / b > In code compiled by I7, a valid identifier is a sequence of 1 to 31 characters,
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which must be alphanumeric or else underscores, except that the leading
character must not be a 0:
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Identifiers::valid< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > wchar_t< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > p< / 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" > Wide::len< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > ) == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) || (< / span > < span class = "identifier-syntax" > Wide::len< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > ) > < / span > < span class = "constant-syntax" > 31< / 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 > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > =0; < / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ]; < / span > < span class = "identifier-syntax" > i< / 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" > Characters::isdigit< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ]) == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > Characters::isalpha< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ]) == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > & & (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ] != < / span > < span class = "character-syntax" > '_'< / 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 > < span class = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > Characters::isdigit< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > p< / span > < span class = "plain-syntax" > [0])) < / 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 > < 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 >
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< / pre >
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< p class = "commentary firstcommentary" > < a id = "SP2" class = "paragraph-anchor" > < / a > < b > § 2. < / b > The following flattens characters into shape:
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< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Identifiers::purify< / 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" > Identifiers::purify< / span > < / span > :< br / > < a href = "3-idn.html#SP3" > § 3< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > LOOP_THROUGH_TEXT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > x< / span > < span class = "plain-syntax" > = < / span > < span class = "identifier-syntax" > Str::get< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / 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" > x< / span > < span class = "plain-syntax" > > = < / span > < span class = "character-syntax" > '0'< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > x< / span > < span class = "plain-syntax" > < = < / span > < span class = "character-syntax" > '9'< / span > < span class = "plain-syntax" > )) ||< / span >
< span class = "plain-syntax" > ((< / span > < span class = "identifier-syntax" > x< / span > < span class = "plain-syntax" > > = < / span > < span class = "character-syntax" > 'a'< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > x< / span > < span class = "plain-syntax" > < = < / span > < span class = "character-syntax" > 'z'< / span > < span class = "plain-syntax" > )) || ((< / span > < span class = "identifier-syntax" > x< / span > < span class = "plain-syntax" > > = < / span > < span class = "character-syntax" > 'A'< / span > < span class = "plain-syntax" > ) & & (< / span > < span class = "identifier-syntax" > x< / span > < span class = "plain-syntax" > < = < / span > < span class = "character-syntax" > 'Z'< / span > < span class = "plain-syntax" > )) || (< / span > < span class = "identifier-syntax" > x< / span > < span class = "plain-syntax" > == < / span > < span class = "character-syntax" > '_'< / span > < span class = "plain-syntax" > )))< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Str::put< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > pos< / span > < span class = "plain-syntax" > , < / span > < span class = "character-syntax" > '_'< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< 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. Automatically composed identifiers. < / b > The following routines are no longer used by Inform, but retained in case
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useful for other projects.
< / p >
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< p class = "commentary" > The idea here is that we want an identifier based on a natural language
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wording, but which passed the above validity tests, and which does not lead
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to namespace collisions. Such identifiers are composed in a pattern which
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uses an identifying letter (e.g., A for Action), a unique ID number
(preventing name-clashes) and then a truncated alphanumeric-safe form of
the words used in the textual description, if any. For example, an object
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called "apple crumble" might have identifier < span class = "extract" > < span class = "extract-syntax" > O100_apple_crumble< / span > < / span > . Any
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other object also called "apple crumble" would have a different identifier
since the number parts would be different.
< / p >
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< p class = "commentary" > Beginning with the identifying letter ensures that we do not open with
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a 0 digit.
< / p >
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< p class = "commentary" > We truncate to 28 characters in length so that other routines can
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concatenate our identifier with up to 3 further characters, if they choose.
< / 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" > Identifiers::compose< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > nature_character< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > int< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > id_number< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-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 = "identifier-syntax" > Str::clear< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > "%c%d"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > nature_character< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > id_number< / 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 = "3-wrd.html#SP11" class = "function-link" > < span class = "function-syntax" > Wordings::nonempty< / span > < / a > < 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" > LOOP_THROUGH_WORDING< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "comment-syntax" > identifier is at this point 32 chars or fewer in length: add at most 30 more< / 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" > Wide::len< / span > < span class = "plain-syntax" > (< / span > < a href = "3-lxr.html#SP19" class = "function-link" > < span class = "function-syntax" > Lexer::word_text< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > )) > < / span > < span class = "constant-syntax" > 30< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > " etc"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > " %N"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > j< / 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" > Str::len< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > ) > < / span > < span class = "constant-syntax" > 32< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Str::truncate< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 28< / span > < span class = "plain-syntax" > ); < / span > < span class = "comment-syntax" > it was at worst 62 chars in size, but is now truncated to 28< / span >
< span class = "plain-syntax" > < / span > < a href = "3-idn.html#SP2" class = "function-link" > < span class = "function-syntax" > Identifiers::purify< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
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< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Identifiers::compose_numberless< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > prefix< / span > < span class = "plain-syntax" > ,< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-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 = "identifier-syntax" > Str::copy< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > prefix< / 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 = "3-wrd.html#SP11" class = "function-link" > < span class = "function-syntax" > Wordings::nonempty< / span > < / a > < 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" > LOOP_THROUGH_WORDING< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > W< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "comment-syntax" > identifier is at this point 32 chars or fewer in length: add at most 30 more< / 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" > Wide::len< / span > < span class = "plain-syntax" > (< / span > < a href = "3-lxr.html#SP19" class = "function-link" > < span class = "function-syntax" > Lexer::word_text< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > j< / span > < span class = "plain-syntax" > )) > < / span > < span class = "constant-syntax" > 30< / span > < span class = "plain-syntax" > )< / span >
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< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > " etc"< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > else< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > WRITE_TO< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > , < / span > < span class = "string-syntax" > " %N"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > j< / 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" > Str::len< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > ) > < / span > < span class = "constant-syntax" > 32< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > }< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > Str::truncate< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > 28< / span > < span class = "plain-syntax" > ); < / span > < span class = "comment-syntax" > it was at worst 62 chars in size, but is now truncated to 28< / span >
< span class = "plain-syntax" > < / span > < a href = "3-idn.html#SP2" class = "function-link" > < span class = "function-syntax" > Identifiers::purify< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > identifier< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
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< / pre >
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< nav role = "progress" > < div class = "progresscontainer" >
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< ul class = "progressbar" > < li class = "progressprev" > < a href = "3-fds.html" > ❮ < / a > < / li > < li class = "progresschapter" > < a href = "P-wtmd.html" > P< / a > < / li > < li class = "progresschapter" > < a href = "1-wm.html" > 1< / a > < / li > < li class = "progresschapter" > < a href = "2-vcb.html" > 2< / a > < / li > < li class = "progresscurrentchapter" > 3< / li > < li class = "progresssection" > < a href = "3-lxr.html" > lxr< / a > < / li > < li class = "progresssection" > < a href = "3-wrd.html" > wrd< / a > < / li > < li class = "progresssection" > < a href = "3-tff.html" > tff< / a > < / li > < li class = "progresssection" > < a href = "3-fds.html" > fds< / a > < / li > < li class = "progresscurrent" > idn< / li > < li class = "progresschapter" > < a href = "4-ap.html" > 4< / a > < / li > < li class = "progressnext" > < a href = "4-ap.html" > ❯ < / a > < / li > < / ul > < / div >
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< / nav > <!-- End of weave -->
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< / main >
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< / body >
< / html >