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<!-- Weave of 'Base64' generated by Inweb -->
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< ul class = "crumbs" > < li > < a href = "../index.html" > Home< / a > < / li > < li > < a href = "index.html" > inblorb< / a > < / li > < li > < a href = "index.html#3" > Chapter 3: Other Material< / a > < / li > < li > < b > Base64< / b > < / li > < / ul > < / div >
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< p class = "purpose" > To produce base64-encoded story files ready for in-browser play by a Javascript-based interpreter such as Parchment.< / p >
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< p class = "commentary firstcommentary" > < a id = "SP1" class = "paragraph-anchor" > < / a > < b > § 1. < / b > The Base64 encoding scheme is defined by the Internet standard RFC 1113.
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Broadly, the idea is to take a binary stream of bytes, break it into
threes, and then convert this into a sequence of four emailable
characters. To encode 24 bits in four characters, we need six bits per
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character, so we need \(2^6 = 64\) characters in all. Since $64 = 26 +
26 + 10 + 2$, we can nearly get there with alphanumeric characters alone,
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adding just two others — conventionally, plus and forward-slash.
That's more or less the whole thing, except that we use an equals sign
to indicate incompleteness of the final triplet (which might have only
1 or 2 bytes in it).
< / p >
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< p class = "commentary" > RFC 1113 permits white space to be used freely, including in particular
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line breaks, but we don't avail ourselves.
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "reserved-syntax" > char< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > RFC1113_table< / span > < span class = "plain-syntax" > = < / span > < span class = "string-syntax" > "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/="< / 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 encoding routine is as follows.
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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" > Base64::encode< / 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" > Base64::encode< / span > < / span > :< br / > Releaser - < a href = "3-rls.html#SP6_5" > § 6.5< / a > < / span > < / button > < span class = "plain-syntax" > (< / span > < span class = "reserved-syntax" > filename< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > in_filename< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > filename< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > out_filename< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > top< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > tail< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > FILE< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > IN< / span > < span class = "plain-syntax" > = < / span > < a href = "../../../inweb/docs/foundation-module/6-bf.html#SP8" class = "function-link" > < span class = "function-syntax" > BinaryFiles::open_for_reading< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > in_filename< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > TO_struct< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > TO< / span > < span class = "plain-syntax" > = & < / span > < span class = "identifier-syntax" > TO_struct< / 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" > STREAM_OPEN_TO_FILE< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > TO< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > out_filename< / span > < span class = "plain-syntax" > , < / span > < span class = "constant-syntax" > UTF8_ENC< / span > < span class = "plain-syntax" > ) == < / span > < span class = "constant-syntax" > FALSE< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < a href = "1-be.html#SP2" class = "function-link" > < span class = "function-syntax" > BlorbErrors::fatal_fs< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "can't open base-64 encoded story file for output"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > out_filename< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "3-bs6.html#SP2" class = "function-link" > < span class = "function-syntax" > Base64::encode_inner< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > TO< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > IN< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > top< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > tail< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < a href = "../../../inweb/docs/foundation-module/6-bf.html#SP8" class = "function-link" > < span class = "function-syntax" > BinaryFiles::close< / span > < / a > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IN< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > STREAM_CLOSE< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > TO< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > }< / span >
< span class = "reserved-syntax" > void< / span > < span class = "plain-syntax" > < / span > < span class = "function-syntax" > Base64::encode_inner< / span > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > OUTPUT_STREAM< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > FILE< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > IN< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > top< / span > < span class = "plain-syntax" > , < / span > < span class = "reserved-syntax" > text_stream< / span > < span class = "plain-syntax" > *< / span > < span class = "identifier-syntax" > tail< / 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" > top< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "%S"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > top< / span > < span class = "plain-syntax" > );< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > while< / span > < span class = "plain-syntax" > (< / span > < span class = "constant-syntax" > TRUE< / 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" > triplet< / span > < span class = "plain-syntax" > [3], < / span > < span class = "identifier-syntax" > triplet_size< / span > < span class = "plain-syntax" > = < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "3-bs6.html#SP2_1" class = "named-paragraph-link" > < span class = "named-paragraph" > Read the triplet of binary bytes, storing 0 to 3 in the size read< / span > < span class = "named-paragraph-number" > 2.1< / span > < / a > < / 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" > triplet_size< / span > < span class = "plain-syntax" > == < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ) < / span > < span class = "reserved-syntax" > break< / 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" > quartet< / span > < span class = "plain-syntax" > [4];< / span >
< span class = "plain-syntax" > < / span > < span class = "named-paragraph-container code-font" > < a href = "3-bs6.html#SP2_2" class = "named-paragraph-link" > < span class = "named-paragraph" > Convert triplet to a quartet< / span > < span class = "named-paragraph-number" > 2.2< / span > < / a > < / 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" > i< / span > < span class = "plain-syntax" > ; < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > =0; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > < 4; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ++) < / span > < span class = "identifier-syntax" > PUT< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > RFC1113_table< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > quartet< / span > < span class = "plain-syntax" > [< / span > < span class = "identifier-syntax" > i< / 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" > triplet_size< / span > < span class = "plain-syntax" > < < / span > < span class = "constant-syntax" > 3< / 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 = "reserved-syntax" > if< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > tail< / span > < span class = "plain-syntax" > ) < / span > < span class = "identifier-syntax" > WRITE< / span > < span class = "plain-syntax" > (< / span > < span class = "string-syntax" > "%S"< / span > < span class = "plain-syntax" > , < / span > < span class = "identifier-syntax" > tail< / 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_1" class = "paragraph-anchor" > < / a > < b > § 2.1. < / b > If the file ends in mid-triplet, we pad out with zeros.
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< / p >
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< p class = "commentary" > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Read the triplet of binary bytes, storing 0 to 3 in the size read< / span > < span class = "named-paragraph-number" > 2.1< / span > < / span > < span class = "comment-syntax" > =< / span >
< / p >
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< pre class = "displayed-code all-displayed-code code-font" >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > triplet< / span > < span class = "plain-syntax" > [0] = < / span > < span class = "identifier-syntax" > fgetc< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IN< / 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" > triplet< / span > < span class = "plain-syntax" > [0] != < / span > < span class = "identifier-syntax" > EOF< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > triplet_size< / span > < span class = "plain-syntax" > ++;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > triplet< / span > < span class = "plain-syntax" > [1] = < / span > < span class = "identifier-syntax" > fgetc< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IN< / 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" > triplet< / span > < span class = "plain-syntax" > [1] != < / span > < span class = "identifier-syntax" > EOF< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > triplet_size< / span > < span class = "plain-syntax" > ++;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > triplet< / span > < span class = "plain-syntax" > [2] = < / span > < span class = "identifier-syntax" > fgetc< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > IN< / 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" > triplet< / span > < span class = "plain-syntax" > [2] != < / span > < span class = "identifier-syntax" > EOF< / span > < span class = "plain-syntax" > )< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > triplet_size< / span > < span class = "plain-syntax" > ++;< / span >
< span class = "plain-syntax" > }< / 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" > i< / span > < span class = "plain-syntax" > ; < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > =< / span > < span class = "identifier-syntax" > triplet_size< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > < 3; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ++) < / span > < span class = "identifier-syntax" > triplet< / 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 >
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< / pre >
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< ul class = "endnotetexts" > < li > This code is used in < a href = "3-bs6.html#SP2" > § 2< / a > .< / li > < / ul >
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< p class = "commentary firstcommentary" > < a id = "SP2_2" class = "paragraph-anchor" > < / a > < b > § 2.2. < / b > < span class = "named-paragraph-container code-font" > < span class = "named-paragraph-defn" > Convert triplet to a quartet< / span > < span class = "named-paragraph-number" > 2.2< / 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" >
< 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" > ; < / span > < span class = "reserved-syntax" > for< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > =0; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > < 4; < / span > < span class = "identifier-syntax" > i< / span > < span class = "plain-syntax" > ++) < / span > < span class = "identifier-syntax" > quartet< / 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" > quartet< / span > < span class = "plain-syntax" > [0] += (< / span > < span class = "identifier-syntax" > triplet< / span > < span class = "plain-syntax" > [0] & < / span > < span class = "constant-syntax" > 0xFC< / span > < span class = "plain-syntax" > ) > > < / span > < span class = "constant-syntax" > 2< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > quartet< / span > < span class = "plain-syntax" > [1] += (< / span > < span class = "identifier-syntax" > triplet< / span > < span class = "plain-syntax" > [0] & < / span > < span class = "constant-syntax" > 0x03< / span > < span class = "plain-syntax" > ) < < < / span > < span class = "constant-syntax" > 4< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > quartet< / span > < span class = "plain-syntax" > [1] += (< / span > < span class = "identifier-syntax" > triplet< / span > < span class = "plain-syntax" > [1] & < / span > < span class = "constant-syntax" > 0xF0< / span > < span class = "plain-syntax" > ) > > < / span > < span class = "constant-syntax" > 4< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > quartet< / span > < span class = "plain-syntax" > [2] += (< / span > < span class = "identifier-syntax" > triplet< / span > < span class = "plain-syntax" > [1] & < / span > < span class = "constant-syntax" > 0x0F< / span > < span class = "plain-syntax" > ) < < < / span > < span class = "constant-syntax" > 2< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > quartet< / span > < span class = "plain-syntax" > [2] += (< / span > < span class = "identifier-syntax" > triplet< / span > < span class = "plain-syntax" > [2] & < / span > < span class = "constant-syntax" > 0xC0< / span > < span class = "plain-syntax" > ) > > < / span > < span class = "constant-syntax" > 6< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "identifier-syntax" > quartet< / span > < span class = "plain-syntax" > [3] += (< / span > < span class = "identifier-syntax" > triplet< / span > < span class = "plain-syntax" > [2] & < / span > < span class = "constant-syntax" > 0x3F< / span > < span class = "plain-syntax" > ) < < < / span > < span class = "constant-syntax" > 0< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > switch< / span > < span class = "plain-syntax" > (< / span > < span class = "identifier-syntax" > triplet_size< / span > < span class = "plain-syntax" > ) {< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 1< / span > < span class = "plain-syntax" > : < / span > < span class = "identifier-syntax" > quartet< / span > < span class = "plain-syntax" > [2] = < / span > < span class = "constant-syntax" > 64< / span > < span class = "plain-syntax" > ; < / span > < span class = "identifier-syntax" > quartet< / span > < span class = "plain-syntax" > [3] = < / span > < span class = "constant-syntax" > 64< / span > < span class = "plain-syntax" > ; < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / span >
< span class = "plain-syntax" > < / span > < span class = "reserved-syntax" > case< / span > < span class = "plain-syntax" > < / span > < span class = "constant-syntax" > 2< / span > < span class = "plain-syntax" > : < / span > < span class = "identifier-syntax" > quartet< / span > < span class = "plain-syntax" > [3] = < / span > < span class = "constant-syntax" > 64< / span > < span class = "plain-syntax" > ; < / span > < span class = "reserved-syntax" > break< / span > < span class = "plain-syntax" > ;< / 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 = "3-bs6.html#SP2" > § 2< / a > .< / li > < / ul >
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< / nav > <!-- End of weave -->
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< / main >
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< / body >
< / html >