agar T=(CL,BK) angah I markaz ertefaE'e BTC khahad bud.
pas T,I,K,L ham dayere and.
dayereye gozara az anha ra W minamim
O, markaze W be roshani ruye khatte TID ast.
pas baraye esbate hokm kafi'e sabet konim ke T ruye dayereye mohaT'e mosallase ABC gharar dare.
b+c=3a --> a=p-a -->...