Add this graph

https://github.com/b-mehta/maths-notes/blob/faab4052da4b5aba0265e6a8f9e90be6d7763cc1/ii/mich/graph_theory.tex#L200

Add the bipartite graph here (consider Hall's theorem)

Open ii/mich/graph_theory.tex around line 200 and read the surrounding discussion, especially the reference to Hall's theorem. Add the requested bipartite graph at that location, then check the rendered notes to confirm the graph appears correctly in context.

Written by the indexing model from the issue text.