anchor.diff:  decode_port(tcp, 50) -> <<"re-mail-ck">>;
   decode_port(tcp, 51) -> <<"la-maint">>;
   decode_port(tcp, 52) -> <<"xns-time">>;
  -decode_port(tcp, 53) -> <<"domain">>;
  +decode_port(tcp, 53) -> <<"dns">>;
   decode_port(tcp, 54) -> <<"xns-ch">>;
   decode_port(tcp, 55) -> <<"isi-gl">>;
   decode_port(tcp, 56) -> <<"xns-auth">>;
  
positive.code: encode_port(tcp, <<"re-mail-ck">>) -> 50;
  encode_port(tcp, <<"la-maint">>) -> 51;
  encode_port(tcp, <<"xns-time">>) -> 52;
  encode_port(tcp, <<"domain">>) -> 53;
  encode_port(tcp, <<"xns-ch">>) -> 54;
  encode_port(tcp, <<"isi-gl">>) -> 55;
  encode_port(tcp, <<"xns-auth">>) -> 56;
  
negative.code: encode_port(udp, <<"re-mail-ck">>) -> 50;
  encode_port(udp, <<"la-maint">>) -> 51;
  encode_port(udp, <<"xns-time">>) -> 52;
  encode_port(udp, <<"dns">>) -> 53;
  encode_port(udp, <<"xns-ch">>) -> 54;
  encode_port(udp, <<"isi-gl">>) -> 55;
  encode_port(udp, <<"xns-auth">>) -> 56;
  