Structural Category

Composite

Specific Usage

Surface

Other Names

1.

2.

Come up at A. Go down at B and come up at C.

Repeat, going down at B and coming up at C.

3.

4.

Go in at D (opposite A) and come out at E.

Repeat, going in at D and coming out at E. E is now the same as A in Step 1. Repeat Steps 1-4 to the end of the row.

5.

6.

Face

Reverse

Diagram source: Pat Albiston, reprinted by permission.