0)  at (-0,0) ;  (-0.0,0) node\[scale=0.00\] [$S$]{};  (-0,0) - (-0.00,0.0); (-0,0) - (-0.00,-0.0); (-0.00,0.0) arc (000:000:0.0);  (0,0) node [+]{};  at (0,0) ; at (0,0) ; at (0,0) ; at (0,0) ; at (0,-0) ;  (0.0,0) node\[scale=0.00\] [$S$]{};  (0,0) - (0.00,0.0); (0,0) - (0.00,-0.0); (0.00,0.0) arc (000:000:0.0);  (0,0) - (0,0); (0,0) to (0,0);  ; (00,-0.0) node [${\mathcal{P}}$ by]{}; (00,-0) node [