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/usr/share/javascript/prettify/lang-rd.js is in libjs-prettify 2013.03.04+dfsg-4.

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PR.registerLangHandler(PR.createSimpleLexer([["pln",/^[\t\n\r \xA0]+/,null,"\t\n\r \u00a0"],["com",/^%[^\r\n]*/,null,"%"]],[["lit",/^\\(?:cr|l?dots|R|tab)\b/],["kwd",/^\\[a-zA-Z@]+/],["kwd",/^#(?:ifn?def|endif)/],["pln",/^\\[{}]/],["pun",/^[{}()\[\]]+/]]),["Rd","rd"]);