C21221212121211331322132313132313231313232233132313223313231311211   >>    C2122121212121133132213231313231323131323223313231322331323131121   <<    C21221212121211331322132313132313231313232233132313223313231311213   >>      C21221212121211331322132313132313231313232233132313223313231311212   >>