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rOACCT/node_modules/clean-css/lib/optimizer/level-2/remove-duplicates.js
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remove-duplicates.js
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			var Token = require('../../tokenizer/token');

			var serializeBody = require('../../writer/one-time').body;
			var serializeRules = require('../../writer/one-time').rules;

			function removeDuplicates(tokens) {
			var matched = {};
			var moreThanOnce = [];
			var id, token;
			var body, bodies;

			for (var i = 0, l = tokens.length; i < l; i++) {
			token = tokens[i];
			if (token[0] != Token.RULE) { continue; }

			id = serializeRules(token[1]);

			if (matched[id] && matched[id].length == 1) { moreThanOnce.push(id); } else { matched[id] = matched[id] \|\| []; }

			matched[id].push(i);
			}

			for (i = 0, l = moreThanOnce.length; i < l; i++) {
			id = moreThanOnce[i];
			bodies = [];

			for (var j = matched[id].length - 1; j >= 0; j--) {
			token = tokens[matched[id][j]];
			body = serializeBody(token[2]);

			if (bodies.indexOf(body) > -1) { token[2] = []; } else { bodies.push(body); }
			}
			}
			}

			module.exports = removeDuplicates;