def METHOD_NAME(l1,m1,l2,m2,l3,m3):
    # try to load c library for calculating cg coefficients
    if cglib:
        return lib.Clebsch_Gordan(l1,m1,l2,m2,l3,m3)
    else:
        return Clebsch_gordan(l1,m1,l2,m2,l3,m3)