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.EQV.
    Logical equivalence:  The logical equivalence of the value on the left
    and the value on the right is produced.

.NEQV.
    Logical non-equivalence:  The logical non-equivalence of the value on
    the left and the value on the right is produced.

.OR.
    Logical inclusive disjunction:  The logical OR of the value on the left
    and the value on the right is produced.

.AND.
    Logical conjunction:  The logical AND of the value on the left and the
    value on the right is produced.

.NOT.
    Logical negation:  The logical complement of the value on the right is
    produced.