gistfile1.txt

      A
     / \
    /   \
   B     C
  /     / \
 D     E   F
      /
     G


A
BC
DEF
G

gistfile2.txt

["car", "rats", "arc", "star", "arc", "tsar", "less", "sell"]

[
 ["car", "arc"],
 ["rats", "star", "tsar"],
 ["less"],
 ["sell"],
]

gistfile3.txt

  +---+      +---+      +---+
->| 1 |   /->| 2 |   /->| 3 |
  |---|  /   |---|  /   |---|
  |   |-/    |   |-/    |///|
  +---+      +---+      +---+