How to Teach This
sort :: OrdDict a - [a] - [a]. Ben Lynn's compiler and MicroHs both use
In the previous example we considered a space which has only one road looping back on itself. The number of times you would walk around the road to get back to the “same” point (or an equivalent point in a different copy) can be encoded using this “winding number” trick:，详情可参考PDF资料
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on this constraint.