//Standard generators of L2(41) are a and b where a has order 2, b has order 3
//and ab has order 41.
//Standard generators of the double cover 2.L2(37) = SL2(37) are preimages A and
//B where B has order 3 and AB has order 41.
_LR := rec < recformat< F: GrpFP, AI: SeqEnum, G: GrpMat > |
      F := FreeGroup(2) >;
_LR`AI:=[[a^-1,b*a*b*a*b*a*b*a*b^-1*a*b*a*b*a*b^-1*a*b^-1*a*b ]]
             where a is (_LR`F).1 where b is (_LR`F).2;
//one constituent (twice), fixed by _LR`AI[1][1]
_LR`G := sub<GL(42,Integers()) |
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0,0,0,0,0,0,0,0,0,0,1,0,0,0,0 ] >;

return _LR;
