"Best way"? By which measurement? I may write it as (untested code): 
my %new_hash;
$new_hash{$_} = [$rep{$_}, $comb{$_}] for keys %rep;

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or 
my %new_hash = map {($_, [$rep{$_}, $comb{$_}])} keys %rep;

[download]

In reply to Re: join two hashes by JavaFan
in thread join two hashes by Anonymous Monk

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