C12313211232233312111111312111133133313331323133323232322223221   >>    C1231321123223331211111131211113313331333132313332323232222322   <<    C12313211232233312111111312111133133313331323133323232322223223   >>      C12313211232233312111111312111133133313331323133323232322223222   >>