Logic

=    n1 n2 -- f Push true if n1 == n2
<    n1 n2 -- f Push true if n1 < n2
>    n1 n2 -- f Push true if n1 > n2
><   n l h -- f Push true if l < n < h
=><= n l h -- f Push true if l <= n <= h
CMP  n1 n2 -- n Compare n1 and n2 and set n to -1, 0, or 1.
                n=0: a1=a2. n=1: a1>a2. n=-1: a1<a2.
MIN  a b -- n   Returns the lowest of a and b
MAX  a b -- n   Returns the highest of a and b
NOT  f -- f     Push the logical opposite of f




