<> <> <<>> <<>> << nibble | nibPrior isOne >> <<>> 0 F | 3 1 E | 3 2 D | 2 3 C | 2 4 B | 1 5 A | 1 6 9 | 1 7 8 | 1 8 7 | 0 9 6 | 0 A 5 | 0 B 4 | 0 C 3 | 0 D 2 | 0 E 1 | 0 F 0 | 0 .