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function declOfNum(number, titles) {
    var number = Math.abs(number);  // Optional. For negative numbers.
    var cases = [2, 0, 1, 1, 1, 2];
    return titles[ (number % 100 > 4 && number % 100 < 20) ? 2 : cases[(number % 10 < 5) ? number % 10 : 5] ];
}