1 1 1 1 0 0 L a1a0 b1b0 00 01 11 10 0 1 1 1 0 0 1 1 0 0 0 0 0 0 1 0 _ __ _ L= a b + a a b + a0b1b0 1 1 1 0 0 G a1a0 b1b0 00 01 11 10 0 0 0 0 1 0 0 0 1 1 0 1 1 1 0 0 _ __ _