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sub ruler { my $n = ($_[0]+9)/10; (sprintf" "."%10s"x$n."\n",1..$n).'0123456789'x$n."0\n"; }
perl -e'$n=(9+shift)/10;printf" "."%10s"x$n."\n%s0\n",1..$n,"012345678 +9"x$n'
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