(*
An example from the Tracery tutorial:
  {"name": ["Arjun","Yuuma","Darcy","Mia","Chiaki","Izzi","Azra","Lina"]
  ,"animal": ["unicorn","raven","sparrow","scorpion","coyote","eagle","owl","lizard","zebra","duck","kitten"]
  ,"mood": ["vexed","indignant","impassioned","wistful","astute","courteous"]
  ,"story": ["#hero# traveled with her pet #heroPet#.  #hero# was never #mood#, for the #heroPet# was always too #mood#."]
  ,"origin": ["#[hero:#name#][heroPet:#animal#]story#"]
  }
*)

fix name := "Arjun" | "Yuuma" | "Darcy" | "Mia" | "Chiaki" | "Izzi" | "Azra" | "Lina";
fix pet ::= unicorn raven sparrow scorpion coyote eagle owl lizard zebra duck kitten;
mood ::= vexed indignant impassioned wistful astute corteous;

puts name " traveled with her pet " pet ". "
     name " was never " mood " for the " pet " was always too " mood ".";