Hi sen try this it gives your exact output,
#!/usr/local/bin/perl
@a1 = qw/1x1 1x12 12x3 10x1 4x12 4x1 1x1 22x3 2x1 4x0 12x1 1x2/;
@out = sort {
(split 'x', $a, 2)[0] <=>
(split 'x', $b, 2)[0]
}
sort {
(split 'x', $a, 2)[1] <=>
(split 'x', $b, 2)[1]
}@a1;
print "@out";
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