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Commit 5153251e authored by Francois-Rene Rideau's avatar Francois-Rene Rideau
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Use NIL for actions visited with status unknown

Use NIL instead of T as the status stored in the visited-actions hash-table
when the status is unknown, and check whether it (or a known status) is present
using the second value of GETHASH. When a known value is sought, keep checking
for the first value.
parent 50832654
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