Table of terrains 
terrains["grass"] = {
  name = "grass",
  trees = {
    "tree-04",
    "tree-05",
    "tree-02",
    "dead-dry-hairy-tree",
    "tree-02-red",
    "dead-grey-trunk",
    "tree-07",
    "tree-09-red",
    "tree-09-brown",
    "tree-03",
    "tree-08-red",
    "tree-08",
    "tree-01",
    "tree-08-brown",
    "tree-09"
  }
}, 
terrains["grass-dry"] = {
  name = "grass-dry",
  trees = {
    "tree-05",
    "tree-04",
    "tree-02",
    "tree-02-red",
    "dead-dry-hairy-tree",
    "dead-grey-trunk",
    "dry-tree",
    "tree-07",
    "tree-09-red",
    "tree-09-brown",
    "tree-08",
    "tree-01",
    "tree-08-red",
    "tree-08-brown",
    "dead-tree",
    "tree-03",
    "dry-hairy-tree",
    "tree-09"
  }
}, 
terrains["sand-dark"] = {
  name = "sand-dark",
  trees = {
    "dead-dry-hairy-tree",
    "dead-grey-trunk",
    "tree-09-red",
    "tree-07",
    "tree-05",
    "tree-04",
    "tree-01",
    "tree-02",
    "tree-08-red",
    "tree-08-brown",
    "tree-03",
    "tree-02-red",
    "tree-08",
    "dry-tree",
    "tree-09-brown",
    "dead-tree",
    "dry-hairy-tree",
    "tree-09"
  }
}, 
terrains["dirt"] = {
  name = "dirt",
  trees = {
    "dead-grey-trunk",
    "dead-dry-hairy-tree",
    "tree-09-red",
    "dry-tree",
    "tree-07",
    "tree-03",
    "tree-01",
    "tree-04",
    "tree-05",
    "tree-02-red",
    "dead-tree",
    "tree-08-red",
    "tree-08",
    "tree-08-brown",
    "tree-02",
    "dry-hairy-tree"
  }
}, 
terrains["red-desert-dark"] = {
  name = "red-desert-dark",
  trees = {
    "tree-07",
    "tree-09-red",
    "dead-dry-hairy-tree",
    "dead-grey-trunk",
    "tree-08",
    "dry-hairy-tree"
  }
}, 
terrains["grass-medium"] = {
  name = "grass-medium",
  trees = {
    "tree-03",
    "dead-dry-hairy-tree",
    "tree-02",
    "tree-05",
    "tree-04"
  }
}, 
terrains["red-desert"] = {
  name = "red-desert",
  trees = {
    "tree-08",
    "dead-grey-trunk",
    "dead-dry-hairy-tree",
    "tree-09-red",
    "tree-07"
  }
}, 
terrains["sand"] = {
  name = "sand",
  trees = {
    "tree-07",
    "tree-09-red",
    "dead-dry-hairy-tree"
  }
},