Bear Limak examine social network its main functionality member friend talk share funny picturesthere n member number 1 n m pair member friend of course member can not friend themselvesLet ab denote member A b friend Limak think network reasonable follow condition satisfied for distinct member X Y Z XY YZ XZFor example Alan Bob friend Bob Ciri friend Alan Ciri friend wellcan help Limak check network reasonable Print yes no accordingly quote