friend double cgc (int factor1_2j, int factor1_2m, int factor2_2j, int factor2_2m,
int irrep_2j, int irrep_2m, const prestore& Prestore);
friend double cgc (int factor1_2j, int factor1_2m, int factor2_2j, int factor2_2m,
int irrep_2j, int irrep_2m, const prestore& Prestore);