the function can be like this(not tested): boolean test(byte[27][9] input) { for ( int i = 0; i < 27; i++) { short result = 0; for (int j=0; j<9; j++) { result |= 1<<(input[i][j]-1); if (result != 0x1ff) { return false; } } return true; }

write loops to test it