
*** excision ***

This is an example of an index pair (for a discrete dynamical system)
which does not satisfy the excision property, as explained in the paper
"Excision-preserving Cubical Approach to the Algorithmic Computation
of the Discrete Conley Index" by K. Stolot and P. Pilarczyk.

The index map in homology must be computed with the program "homcub2l"
which operates on two-layer cubical sets, because the computation with
the program "homcubes" fails.
