Actionscript:
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var leng:int = 10;
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for (var i:int = 0, j:int = leng; i <leng; i++, j = leng - i){
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trace(i, j);
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}
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/*outputs
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0 10
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1 9
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2 8
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3 7
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4 6
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5 5
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6 4
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7 3
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8 2
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9 1
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*/
Looping backwards and forwards.