ii ii
                     ii ii
                     ii ii
                     ii ii              tt
                     ii ii              tt
                     ii ii              tt
                                      tt
                                      tt
                                      tt
          aaaa  ssss  cccc ii ii   ppppp  aaaa  rrrrttttyy  yy
          aaaa  ssss  cccc ii ii   ppppp  aaaa  rrrrttttyy  yy
          aaaa  ssss  cccc ii ii   ppppp  aaaa  rrrrtttty   y
           a aa ss ss cc ccii ii   pp pp aa aa rrr tttyy  yy
           a aa ss ss cc ccii ii   pp pp aa aa rrr  ttyy  yy
           a aa ss ss cc ccii i----p- pp aa aa rrr  tty   y
           aaaa ss   cc  ii ii ------pp pp  aaaa rr  tt yy yy
           aaaa ss   cc  ii ii ------pp pp  aaaa rr  tt yy yy
           aaaa ss   cc  ii ii ------pp pp  aaaa rr  tt y  y
          aa aa ssss  cc  ii ii   pp pp  aaaa rr  tt yy yy
          aa aa ssss  cc  ii ii   pp pp  aaaa rr  tt yy yy
          aa aa ssss  cc  ii ii   pp pp  aaaa rr  tt y  y
          aa aa   ss cc  ii ii   pp pp aa aa rr  tt yyyy
          aa aa   ss cc  ii ii   pp pp aa aa rr  tt yyyy
          aa aa   ss cc  ii ii   pp pp aa aa rr  tt  yyy
           a aa ss ss cc ccii ii   pp pp aa aa rr  tt yyyy
           a aa ss ss cc ccii ii   pp pp aa aa rr  tt yyyy
           a aa ss ss cc ccii ii   pp pp aa aa rr  tt  yyy
          aaaaa  ssss  cccc ii ii   ppppp  aaaaa rr  tt yy
          aaaaa  ssss  cccc ii ii   ppppp  aaaaa rr  tt yy
          aaaaa  ssss  cccc ii ii   ppppp  aaaaa rr  tt  y
                           pp             yy
                           pp             yy
                           pp             y
                           pp            yy
                           pp            yy
                           pp             y
                           pp            yy
                           pp            yy
                           pp            y