If the order matters, then you'll have to use arrays. Better assign two keys to your $hash, one for an array of numbers (say @{$hash->{numbers}}) and one for an array of signs ( @{$hash->{signs}}). Then look within the numbers array ( @{$hash->{numbers}}, find the corresponding $i (that is $hash->{numbers}->[$i]) and extract the two signs: $hash->{signs}->[$i] and $hash->{signs}->[$i + 1].
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