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    ' ' x $expr;

use warnings; use strict;
my $col=10; my $maxcol=40;
my $str = ' ' x $col%$maxcol;

     left        * / % x
     left        + - .

1)    left        * / %
2)     left        + -
3)     left        x
4)     left        .

Argument "          " isn't numeric in addition (+) at -e line 2.

Argument "          " isn't numeric in modulus (%) at -e line 2.