I've looked at this for a few days but still can't see 'why'
I get what I do. 
Why do @arrays and @seconds not have the same number of elements? 
Thanks,
Mike

{   my %HoAoA = (
          a => [ [ qw / aa1 aa2 / ], [ qw / ab1 ab2 / ] ],
          b => [ [ qw / ba1 ba2 / ], [ qw / bb1 bb2 / ], [ qw / bc1 bc2 / ] ],
          );

    #   this gets refs to all arrays
    my @arrays = map { @{ $HoAoA{$_} } [ 0..$#{ $HoAoA{$_} } ] }  keys %HoAoA ;
    #   this only gets the second entry from the last array of each hash entry
    my @seconds = map { @{ $HoAoA{$_} } [ 0..$#{ $HoAoA{$_} } ]->[1] }
                                                                  keys %HoAoA ;
    print "\...@arrays = @arrays\n";
    print "\...@seconds = @seconds\n";
}
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