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#!/usr/bin/perl

...

map { print( ( $_ % 2 ? @odd : @even ), "+$_" ) } @numbers;
map { push( ( $_ % 2 ? @odd : @even ), "+$_" ) } @numbers;

4 10 +6
1 5 3 +7
4 10 +8
1 5 3 +9
Not an ARRAY reference at ./push_fail.pl line 13.