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alert(ar[1][2]);
var ar = new Array();
ar[0] = new Array();
ar[0].push('a');
ar[0].push('c');
var ar2 = [1,2,3,4,5];
ar[1] = ar2;
var arr = {};
for (var x = 1; x < 10; x++) {
for (var y = 1; y < 10; y++) {
arr[[x, y]] = x * y;
}
}
alert(arr[[3, 9]]);