% buffer WEST
\newsavebox{\otw}
\savebox{\otw}(9,6){
\begin{picture}(9,6)
\put(7,3){\line(1,0){2}}
\put(7,0){\line(0,1){6}}
\put(7,6){\line(-5,-3){5}}
\put(2,3){\line(5,-3){5}}
\put(0,3){\line(1,0){2}}
\end{picture}
}