Sample 4

deer → 1elk → 1blackbuck → 1pony → 2mule → 2male-horse → 2warhorse → 3goat → 4sheep → 5bison → 6zebra → 72 → 33 → 44 → 55 → 66 → 71 → 21234567deerelkblackbuckponymulemale-horsewarhorsegoatsheepbisonzebra