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#!/usr/bin/perl -w
use strict;
...
print $x . " " for 1..10;
print "\n\n";
__END__

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Case: 1 (good)
0123456789
...
Case: 4 (yikes)
1 3 5 7 9 11 13 15 17 19 
1 3 5 7 9 11 13 15 17 19