GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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  5 Service functions of the Congruence package
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  5.1 Additional information displayed by Congruence algorithms
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  5.1-1 InfoCongruence
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  InfoCongruence info class
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  InfoCongruence  is  a special Info class for Congruence algorithms. It has 3
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  levels: 0, 1 (default) and 2. To change the info level to k, use the command
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  SetInfoLevel(InfoCongruence, k).
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  In  the  example  below we use this mechanism to see more details during the
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  Farey symbol construction for a congruence subgroup.
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