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Toads and Frogs
Some children think that toads are more dangerous than frogs. It isn't so.
They are not dangerous at all.
Toads are (big) than frogs.
But toad's legs are (short) than frogs'.
Frogs are (fast) than toads.
Usually frogs are (small) than toads but the Goliath frog is the (big) frod in the world. It lives in Africa.
It is (large) than a duck.