Let's see. 

my %new_hash = map { my $v = $hash{$_}; $$v[0], [$_, @$v[1 .. @$v - 1]
+] } keys(%hash);

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In reply to Re: Using MAP to swap around HoA hash keys and array values. by ambrus
in thread Using MAP to swap around HoA hash keys and array values. by awohld

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