Graycode (Algorithm 246 [Z])

CACM December, 1964

Boothroyd, J.

CA641202 JB March 9, 1978  3:44 PM

969	5	969
969	5	969
969	5	969
2834	5	969
969	6	969
2045	6	969
2417	6	969
2466	6	969