C1212121231123232233131323223313231333132322133313232233132211111   >>    C121212123112323223313132322331323133313232213331323223313221111   <<    C1212121231123232233131323223313231333132322133313232233132211113   >>      C1212121231123232233131323223313231333132322133313232233132211112   >>