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								var baseIndexOf = require('./_baseIndexOf');
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								/**
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								 * Used by `_.trim` and `_.trimEnd` to get the index of the last string symbol
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								 * that is not found in the character symbols.
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								 *
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								 * @private
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								 * @param {Array} strSymbols The string symbols to inspect.
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								 * @param {Array} chrSymbols The character symbols to find.
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								 * @returns {number} Returns the index of the last unmatched string symbol.
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								 */
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								function charsEndIndex(strSymbols, chrSymbols) {
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								  var index = strSymbols.length;
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								  while (index-- && baseIndexOf(chrSymbols, strSymbols[index], 0) > -1) {}
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								  return index;
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								}
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								module.exports = charsEndIndex;
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