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gap> START_TEST("HAP library");
gap> Q:=QuadraticNumberField(-2);;
gap> OQ:=RingOfIntegers(Q);;
gap> I:=QuadraticIdeal(OQ,4+5*Sqrt(-2));;
gap> G:=HAP_CongruenceSubgroupGamma0(I);;
gap> IndexInSL2O(G);
144
gap> R:=ResolutionSL2QuadraticIntegers(-2,3,true);;
gap> S:=ResolutionFiniteSubgroup(R,G);
Resolution of length 3 in characteristic 0 for <group of 2x
2 matrices in characteristic 0> .
gap> STOP_TEST( "tst.tst", 1000 );
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