The first type: 1, 2, 3, 4-all four numbers are called on the left foot and are continuous. Left, empty, left, empty, left, empty, left.

The second type: 123. 4- Left, right, left, empty, left.

The third type:12,34-left, right, empty, empty, left and right.

The fourth type: 1, 2,34-left, empty, left, empty, left and right.