Class 1: p00000, p11111 Class 2: p00001, p00010, p11101, p11110 Class 3: p00011, p11100 Class 4: p00100, p01000, p01111, p10000, p10111, p11011 Class 5: p00101, p00110, p01001, p01010, p01101, p01110, p10001, p10010, p10101, p10110, p11001, p11010 Class 6: p00111, p01011, p01100, p10011, p10100, p11000