boolean isLegalBox (int row, int col, int num) {
		int x = (row / 3) * 3 ;
		int y = (col / 3) * 3 ;
		for( int r = 0; r < 3; r++ ) {
			for( int c = 0; c < 3; c++ ) {
				if(r != row && c != col) {
					if( boardArray[y+c][x+r] == num ) {
						return false;
					}
				}

			}
		}
		return true;
	}