C12121223131323223313132322331323132313231333132322132313221121   >>    C1212122313132322331313232233132313231323133313232213231322112   <<    C12121223131323223313132322331323132313231333132322132313221123   >>      C12121223131323223313132322331323132313231333132322132313221122   >>