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