What Goes With A Wagon?
What goes with a wagon that
doesn’t benefit the wagon,
but the wagon cannot move without?
I don’t know the answer yet, but the members of this riddle forum at Berkeley are working on a solution.
http://www.ocf.berkeley.edu/~wwu/cgi-bin/yabb/YaBB.cgi?board=what_am_i;action=display;num=1207561269
note: if you drag your cursor over the orange blocks there, you can see their guesses.
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