==================
basic lark
==================
+
-
---

(source_file
    (lark) (Gap)
    (lark)
)

==================
long lark
==================
+>
-<
+<-
->+<-<+>->+<
->+<-<+>->+
->+<-<+>->+>+<-<+>->+
---

(source_file
    (lark) (Gap)
    (lark) (Gap)
    (lark) (Gap)
    (lark) (Gap)
    (lark) (Gap)
    (lark)
)