perl -e 'for (0..100){$randhash{int (rand() * 100)} += 1}; print join 
+qq|\n|,sort {$a<=>$b} keys %randhash;'

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Check elements that have > 1 in the value and recompute until you find a key that does fails exists.

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In reply to Re: Check randomly generated numbers have not been used before by InfiniteSilence
in thread Check randomly generated numbers have not been used before by R3search3R

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