WHOA. Predict the output??? Having run it and stared at it a few different ways, I'm still struggling just to understand the output... and I don't think I get it at all. Even like this:

print "$_$/" foreach (sort keys %h);
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and dumping through something like "od":

 1  a 74  a 74 31  a 75  a 75 31  a 76  a  a
?? \n  t \n  t  1 \n  u \n  u  1 \n  v \n \n
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What is this?

update: thank you Chmrr! (again!) My world is right-side-up once more.