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**Problem 10.0.1**
Implement an algorithm to enumerate all cusps for a congruence
subgroup.

**Problem 10.0.2**
Finish implementing the algorithm in my book (on modular forms) for
computing generators of congruence subgroups, determining element
membership, write elements in terms of generators, etc. I
(=william) wrote some of the code already, but it's not finished.

William Stein
2006-10-20