[ramxwhcb] 2 by 1 by 1 building block

Two 1x1x2 building blocks, with their surfaces partitioned into 1x1 squares the obvious way, can be joined in many different ways, touching at a positive integer number of squares.  I think 5 ignoring chirality.

In contrast, two 2x2x2 cubes can only join in 3 ways.

Previously triangles.