premise: The small girl in the Hello Kitty gloves and red snowsuit smiles while sitting on a large snowball. hypothesis: A small girl is sitting on a completed snowman.
contradiction: The small girl is either sitting on a completed snowman, or on a large snowball. A completed snowman is usually made up of seveal snowballs and other pieces, whereas a single large snowball is just one ball of snow and not at all the same thing.