GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it
############################################################################# ## #W id1875.z GAP library of id's Hans Ulrich Besche ## ID_GROUP_TREE.next[1875]:= rec( fp:= [ 1 ], next:= [ rec( fp:= [ 15 ], next:= [ rec( fp:= [ 57056, 66198 ], next:= [ 21, 20 ] ) ] ) ] );