C212212121212113313221323131323131323132322331323132233132313222121   >>    C21221212121211331322132313132313132313232233132313223313231322212   <<    C212212121212113313221323131323131323132322331323132233132313222123   >>      C212212121212113313221323131323131323132322331323132233132313222122   >>