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  1. or download this
    time perl -le '$x=1e9;$y=0;$y+=$_ for 1..$x;print$y'
500000000500000000
...
real    0m7.323s
user    0m55.095s
sys     0m0.127s
  2. or download this
    perl -le '$a="a";for(1..30){print$a++}'