C1212121231123232233131323223313232213231333131122233132311211311   >>    C121212123112323223313132322331323221323133313112223313231121131   <<    C1212121231123232233131323223313232213231333131122233132311211313   >>      C1212121231123232233131323223313232213231333131122233132311211312   >>