In this task, you're given a pair of sentences, sentence 1 and sentence 2, that neither agree with nor contradict each other. Your job is to alter sentence 2 so that the pair clearly 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.

Sentence 1: A blond woman smiles behind a bar. Sentence 2: A blonde haired woman smiles at the man across the room.
The woman behind the bar with blond hair smiles.

Sentence 1: A door in a tall concrete wall Sentence 2: A door in a wall of at stone building.
A door in a wall.

Sentence 1: Two men are singing and playing guitars outside a cement structure with spectators sitting on steps on their left. Sentence 2: Two men are singing and playing guitars to raise money for charity.

There is a group watching two men play guitar and sing.