C21221212121211331322132313132313231313232233132313223313132322121121   >>    C2122121212121133132213231313231323131323223313231322331313232212112   <<    C21221212121211331322132313132313231313232233132313223313132322121123   >>      C21221212121211331322132313132313231313232233132313223313132322121122   >>