li:{} [root] FIRST ta:{empty} LAST ta:{non-empty}
 ta:{empty} cols: 0, rows: 0
 ta:{non-empty} cols: 2, rows: 4
  Row 0:{rowname0}
   te:{} {00}
   te:{} {01}
  Row 1:{rowname1}
   te:{} {10}
   te:{} {11}
  Row 2:{rowname2}
   te:{} {20}
   li:{21} FIRST te:{} LAST te:{}
    te:{} {a}
    te:{} {b}
    te:{} {c}
    te:{} {d}
  Row 3:{rowname3}
   te:{} {30}
   ha:{31} entries: 4
    te:{c} {3}
    te:{d} {4}
    te:{a} {1}
    te:{b} {2}
