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for(my $i=10;$i<=0;$i++) {
  # do something
}

for my $i (reverse 0..10) {
  # do something
}

for $a(-2,12){for $b(0..7){$c=0;$_?hex substr(
ef7fa1866706caeff02289402844,2*$_+$a,2)&2**(7-$b):0
and $c+=2**(7-$_)for(0..7);print chr $c;}}