{
  "axiom": "FTFTFTFTFTFT",
  "rules": {
    "T": "[+A][+a][+a][++A]",
    "A": "F[+A][+a][++a]",
    "a": "F[+a][+a]"
  },
  "angle": 20,
  "iterations": 4,
  "start_heading": 90
}