TASK DEFINITION: In this task, you're given a pair of sentences, sentence 1 and sentence 2, that agree with each other. Your job is to alter sentence 2 so that the pair contradict each other. Generated sentences must be short, with less than 15 words. New information can be introduced. Avoid using pronouns to confuse the subject of the sentence.
PROBLEM: Sentence 1: A man wearing no shirt climbs a steep cliff. Sentence 2: A shirtless man was climbing up the face of the cliff.

SOLUTION: The lady was hiking the mountain.

PROBLEM: Sentence 1: A guy, wearing a Superman costume and cowboy hat, is carrying a sign about Designer Bags costing$ 10.00. Sentence 2: A man is holding a sign.

SOLUTION: A group of people are holding signs.

PROBLEM: Sentence 1: Three people are standing outside in front of a low stone wall. Sentence 2: Three people standing by a stone wall.

SOLUTION:
Seven people are sitting on the edge of a wall.