jj     0000      ii
           00  00                      nt
           00  00                      nt
  jjjjj    00  00   iiii    iinnnn    nnttt
     jj    00  00     ii     inn nn    nt
     jj    00  00     ii     in  nn    nt
     jj    00  00     ii     in  nn    nt
     jj    00  00     ii     in  nn    nt tt
     jj     0000    iiiiii  iinnnnnn    ttt
     jj
  jjjj