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Proposal #9: Fast testing in PROGV

    From: Jeff Barnett <jbarnett@nrtc>

    It was assumed in this and a previous message that looking for
    duplicate names in the variable-list argument of a PROGV is an
    N**2 operation....  It can be done in N*log N time.

You can put a mark on the property lists of the variables
for a linear algorithm.