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Argument "42 32 22" isn't numeric in multiplication (*) at ./multigear
+.pl line 19, <STDIN> line 3.
Argument "11 13 15 17 19 21" isn't numeric in division (/) at ./multig
+ear.pl line 19, <STDIN> line 3.
Use of uninitialized value in division (/) at ./multigear.pl line 20, 
+<STDIN> line 3.
Illegal division by zero at ./multigear.pl line 20, <STDIN> line 3.

#!/usr/bin/perl
use strict;
use warnings;
...
print "@gear1\n\n";
print "@gear2\n\n";
print "@gear3\n\n";