Rabbits are more expensive than mice.

Rabbits/expensive/mice

Hamsters are not as expensive as guinea pigs.

hamsters/not/expensive/guinea pigs

parrots/expensive/iguanas

dogs/expensive/cats

dogs/not/expensive/parrots

frogs/cheap/snakes

Fish are not as expensive as rats.

fish/not/expensive/rats

Iguanas are cheaper than parrots.

iguanas/cheap/parrots

Frogs are not as expensive as cats.

frogs/not/expensive/cats

Mice are cheaper than rabbits.

Mice/cheap/rabbits

Hamsters are not as expensive as rats.

hamsters/not/expensive/rats

Guinea pigs are more expensive than hamsters.

guinea pigs/expensive/hamsters

Mice are not as expensive as rabbits.

Mice/not/expensive/rabbits

Fish are cheaper than rats.

fish/cheap/rats

Hamsters are cheaper than rats.

hamsters/cheap/rats