NATREE-DEBUG is a flag or parameter.
To enable the debugging facilities associated with NAT-ETREE. This
should eventually evolve into a flag with more choices.
NATREE-DEBUG takes values of type BOOLEAN.
It belongs to subjects MS93-1 MS92-9 MS88 MS89 MS91-6 MS91-7 MS90-9 MS90-3 MATING-SEARCH .
Its default value is T
Its current value is NIL.

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