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Free List

    Date: 12 MAR 1979 1100-EST
    From: KMP at MIT-MC (Kent M. Pitman)

    Don't you think the free list in Lisp wastes a lot of space? If the right
    half of every cell is going to be NIL anyway, why not use only half of the
    space on the free storage list for info about where the list is and free
    the remaining cells for something useful?
But if the remaining cells were being used for something useful, they would not be free....