^
            / \
           /   \
          /loop \
         /       \
        ^---------^
       /]\       / \
      ^---^     ^---
     / \ /a\   / \
    /set\---   ---^
   ^-----^       / \
  /a\   /l\      ---^
  ---  /ine\       / \
       -----       ---^
                     / \
                    /   \
                   /?    \
                  ^-------^
                 /!\     / \
                ^---    /out\
               / \      -----^
              /   \         / \
             /     \       /arg\
            /       \     ^-----^
           /         \   /a\   /4\
          /?          \  ---   ---
         ^-------------^
        / \           / \
       /   \         /out\
      /     \        -----^
     /=      \           / \
    ^---------^         /arg\
   / \       / \       ^-----^
  /arg\     /arg\     /a\   /2\
 ^-----^   ^-----^    ---   ---
/a\   /1\ /a\   /2\
---   --- ---   ---