1 []
   2 ["a"]
   3 [""]
   4 ["","a"]
   5 [""]
   6 ["","a"]
   7 ["a","","a","","a"]
   8 ["","",""]
   9 ["","",""]
  10 100
  11 ["a","","a","","a"]
  12 100
  13 ["a"]
  14 100