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- var x = [1, 3, 2, 3, 4, 3, 1];
- var a1 = [];
- var a2 = [];
- for (i=0; i<x.length; i++)
- {
- if (a1.indexOf(x[i]) > -1 && a2.indexOf(x[i]) == -1)
- {
- a2.push(x[i]);
- }
- a1.push(x[i]);
- }
- console.log(a2);
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