crossing4.pl (v0.02) works with the correct output.
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crossing4.pl (v0.01) now works, but produces exesive amount of states
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crossing4.pl and nv versions only current in 
~juell/cs724pub/crossing on sod, at this time.
<P>
fix applied to crossing3.pl 2/9/99 3pm
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chagnes to init and a line of looked_at(junk)