You may couple this units in several ways. In this diagrams a rectangle
 of 1:3 is used to create a garland.
 Other constellations are possible too, as shown in the diagrams at the end.

  1

  2

  3

  4

  5

  6

  7  Normal unit

  8  Stop unit (mind flaps)

Flap

Pocket

  9  Put flaps in pockets of other unit to couple

 two units.

 10  Couple 4 units like this

 11  Bend units as shown

 to lock firmly

 12  Couple units to this two by two to make

 a garland. Use stop unit at the ends.

 13  This network consists of two kinds of rings:

 6 unit rings and 2 unit rings.

 14  Crystal of 4 unit rings in three dimensions