Variables
Const Conjunction
Conjunction: "builtin_conjunction" = "builtin_conjunction"
Const Head
Head: "builtin_head" = "builtin_head"
Const Preposition
Preposition: "builtin_preposition" = "builtin_preposition"
Const Tail
Tail: "builtin_tail" = "builtin_tail"
The strings associated with various built-ins