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sub ruler { my $n = 9 + shift; chop $n; join "", " ", map(" "x(9-/../).$_, 1..$n), "\n", "0123456789" x $n, "0\n" }
sub ruler { my $n = shift; join"", " ", map(" "x(9-/../).$_, 1..$n/10), "\n", map(/.$/g, 0..$n), "\n" }
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