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function dependentStrings() { var a = []; var t = "abcdefghijklmnopqrst"; for (var i = 0; i < 10; i++) { var s = t.substring(2*i, 2*i + 2); a[i] = s + s.length; } return a.join(""); } assertEq(dependentStrings(), "ab2cd2ef2gh2ij2kl2mn2op2qr2st2");