Practice 1

1.6 2.6 3.6 4.6 | 1.5 2.5 3.5 4.5 | 1.4 2.4 3.4 4.4 | 1.3 2.3 3.3 4.3 | 1.2 2.2 3.2 4.2 | 1.1 2.1 3.1 4.1