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  1. or download this
    Benchmark: timing 2500 iterations of grepGen, mapGen, smartGen...
       grepGen: 34 wallclock secs (34.35 usr +  0.00 sys = 34.35 CPU) @ 72
    +.78/s (n=2500)
        mapGen: 14 wallclock secs (14.09 usr +  0.00 sys = 14.09 CPU) @ 17
    +7.47/s (n=2500)
    ...
    1 12 15 18 19 20 21 22 23 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
    + 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
    + 64 65 66 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87
    + 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 104 105 106 107 108 
    +109 110 111 112 113 114 116 117 118 119
    smart:
    0 1 2 3 5 7 8 9 12 13 15 16 18 19 21 22 23 25 26 27 28 29 30 31 32 33 
    +34 35 36 37 38 39 42 43 44 45 46 47 48 51 52 53 54 55 56 57 58 59 60 
    +61 62 63 64 65 66 68 69 70 71 72 73 74 75 76 77 78 79 81 83 84 85 86 
    +87 89 90 91 92 93 94 95 96 97 98 100 101 102 104 105 106 107 108 109 
    +110 111 112 113 116 117 118 119
    
  2. or download this
    #!/usr/bin/perl
    
    ...
        }
        return @sArray;
    }