earth mammal, earth dog, earth cat, earth horse, earth naysayer, earth bird {
  blood: warm; }

earth mammal, earth dog, earth cat, earth horse, earth naysayer {
  produces-milk: true; }

dog {
  says: "Woof!"; }

cat {
  says: "Meow."; }

horse, naysayer {
  says: "Nay."; }

[hey], ho {
  a: b; }

ho {
  c: d; }

fancy outer space vehicle, fancy outer space new american mars rover, new american mars fancy outer space rover {
  insides: advanced; }

new american mars rover {
  wheels: big; }

foo, a b c {
  something: whatever; }

a b c {
  blah: blah; }

d e f, d e g {
  blah: blah; }

g {
  bloo: bloo; }