   integer subtraction
*    integer   integer   integer     integer multiplication
/    integer   integer   integer     integer division
MOD  integer   integer   integer     integer remainder
OR   Boolean   Boolean   Boolean     disjunction
AND  Boolean   Boolean   Boolean     conjunction
-    integer             integer     integer negation
~    Boolean             Boolean     Boolean complement
</pre>

    Equality yields the value true if its operands have the same
    value.  Otherwise, it yields the va