I really like the /./sg trick, but why use the /s? Getting rid of that newline has been one of the big obstacles on the course. Stealing this trick (w/o the /s) lets me get rid of the $/ $\ nonsense, shortening my return-the-whole-list code to 52 chars!

#        1         2         3         4         5
#234567890123456789012345678901234567890123456789012
@_=sort@_;$"='?';grep{(join'',sort/./g)=~/^@_?$/}<D>
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-Blake