premise: A group of women are eating on a terrace. hypothesis: Girls getting tan on the beach.
contradiction: The phrase 'group of women' indicates females who have reached adulthood, while the word 'girl' connotates a female of a younger age.  Further, females cannot be eating on a terrace, during which the would reasonably be fully dressed and at a table on a paved surface and on the sand in bathing suits getting tan on the beach.