D1212121221323132313232332313132313233231323223313232233132212121   >>    D121212122132313231323233231313231323323132322331323223313221212   <<    D1212121221323132313232332313132313233231323223313232233132212123   >>      D1212121221323132313232332313132313233231323223313232233132212122   >>