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# gap-pkg-congruence
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[The Congruence package](https://gap-packages.github.io/congruence/) provides
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functions to construct several types of canonical congruence subgroups in
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`SL_2(Z)`, and also intersections of a finite number of such subgroups.
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Furthermore, it implements the algorithm for generating Farey symbols for
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congruence subgroups and using them to produce a system of independent
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generators for these subgroups.
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