System.out.println("----- Other tests a3 -----");
	printArray(ArrayTool.getColumn(a3, 2)); //1,3
	printArray(ArrayTool.getColumn(a3, 4));
	printArray(ArrayTool.getColumn(a3, 8));
	printArray(ArrayTool.getRow(a3,1));
	printArray(ArrayTool.getRow(a3,2));
	System.out.println(ArrayTool.getColumnSum(a3,2));
	System.out.println(ArrayTool.getColumnSum(a3,4));
	System.out.println(ArrayTool.getColumnSum(a3,8));

	System.out.println("----- Other tests a4 -----");
	printArray(ArrayTool.getColumn(a4, 0));
	printArray(ArrayTool.getColumn(a4, 2));
	System.out.println(ArrayTool.getColumnSum(a4,0));
	System.out.println(ArrayTool.getColumnSum(a4,2));
	printArray(ArrayTool.getRow(a4,2));