This adds a program to construct the chord diagrams corresponding to a thrackle embedding of two 5-cycles sharing a vertex
This adds a program to construct the parity vectors for the crossings corresponding to chords arriving in the same 'area'
Small python program to verify that a chord diagram corresponds to a bipartite graph
Fixed bug: set the pointers for the children to NULL. Usually this will already be the case, but it is best to be sure.
This adds a program using the close intersection matrix approach.
In this approach we generate all possible parities of close intersections for each group of chords.