False =0
True  =not( False)

print " True ="; True, "False ="; False, "NB True here shown as -1"
print

print " a   b    AND  OR   XOR"
a =0: b =0: print " "; a; "   "; b; "     "; a and b; "    "; a or  b; "    "; a xor b
a =0: b =1: print " "; a; "   "; b; "     "; a and b; "    "; a or  b; "    "; a xor b
a =1: b =0: print " "; a; "   "; b; "     "; a and b; "    "; a or  b; "    "; a xor b
a =1: b =1: print " "; a; "   "; b; "     "; a and b; "    "; a or  b; "    "; a xor b

end