A better way of doing this:
@a{qw{ a b c }} = (); # not (1)x3 or whatever
foreach (qw{ a b c }) {
print "$_\n" if exists $a{$_};
}
Thus we don't have to worry about being sure the values of the hash are all present and what-not. Specify an empty list on the right-hand-side to set the values all to undef, and just use exists to see if it's there. It's also slightly faster (but not much).
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