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NOT and NULL: addendum to previous note

The merging of the functionality of NOT and NULL makes it
mechanically impossible to separate out the usages of null
as the nullist from those usages as "false";  this merger,
of course, was almost demanded by the lack of a "false"
distinct from null.   In fact, both names, NOT and NULL,
are probably around since antiquity, but there has not been
the two separate functionalities.