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