a = 00 b = 00 a = 01 b = fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffeffffffff0000000000000000fffffffe a = 02 b = fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffeffffffff0000000000000000fffffffd a = 03 b = fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffeffffffff0000000000000000fffffffc a = fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffeffffffff0000000000000000fffffffe b = 01 a = 7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7fffffff80000000000000007fffffff b = 7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7fffffff800000000000000080000000 a = 7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7fffffff800000000000000080000000 b = 7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff7fffffff80000000000000007fffffff a = 800000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 b = 7ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffeffffffff0000000000000000ffffffff