Taking a Walk
o
|
|
end
Taking a Walk
 o
 |
/ \
end
Taking a Walk
  o
  |
  |
end
Taking a Walk
   o
   |
  / \
end
Taking a Walk
    o
    |
    |
end
Taking a Walk
     o
     |
    / \
end
Taking a Walk
      o
      |
      |
end
Taking a Walk
       o
       |
      / \
end
Taking a Walk
        o
        |
        |
end
Taking a Walk
         o
         |
        / \
end