-\newcommand{\grefz}{ T^0 }
-\newcommand{\grefc}{ T }
-\newcommand{\grefu}{ T' }
-\newcommand{\greff}{ T^* }
-
-\newcommand{\grefza}[1]{ \grefz_{#1} }
-\newcommand{\grefca}[1]{ \grefc_{#1} }
-\newcommand{\grefua}[1]{ \grefu_{#1} }
-\newcommand{\greffa}[1]{ \greff_{#1} }
-
-\newcommand{\grefzc}{ \grefza \pc }
-\newcommand{\grefcc}{ \grefca \pc }
-\newcommand{\grefuc}{ \grefua \pc }
-\newcommand{\greffc}{ \greffa \pc }
+\newcommand{\tip}{ T }
+\newcommand{\tipa}[1]{ \tip^{#1} }
+\newcommand{\tipcn}{ \tipa \pcn }
+\newcommand{\tipcy}{ \tipa \pcy }
+\newcommand{\tipdn}{ \tipa \pdn }
+\newcommand{\tipdy}{ \tipa \pdy }