C1212121231123232233131323223313233313233313223313233313132313221   >>    C121212123112323223313132322331323331323331322331323331313231322   <<    C1212121231123232233131323223313233313233313223313233313132313223   >>      C1212121231123232233131323223313233313233313223313233313132313222   >>