C212212121212113313221323131323131323132322331323132233132333132333112312121   >>    C21221212121211331322132313132313132313232233132313223313233313233311231212   <<    C212212121212113313221323131323131323132322331323132233132333132333112312123   >>      C212212121212113313221323131323131323132322331323132233132333132333112312122   >>