Square-1
========

The solve_shape_square1 script is a simple-minded helper to solve the
Square-1 puzzle, which is similar to Rubik's Cube, but has the
important difference that its shape can change away from the cube:

https://en.wikipedia.org/wiki/Square-1_(puzzle)

This script helps to solve the shape of a Square-1 (back to a cube)
but it does not help to solve the colors.  It produces the shortest
moves from the initial shape (the cube) to any other shape using a
breadth-first search.