array{ 1 2 3 }
  dict{ { "a" 1 } }
  graph{ { "a" "b" } { "b" "c" } { "c" "a" } }
  AVL{ { "a" 1 } { "b" 2 } } 

Factor has some syntax like this. All you have to do is pass the `{...}` to the prefix (array/dict/graph/AVL) and it knows how to construct one.

https://github.com/factor/factor/blob/master/extra/trees/avl...