In this task, you're given a pair of sentences, sentence 1 and sentence 2. Your job is to choose whether the two sentences clearly agree (entailment)/disagree (contradiction) with each other, or if this cannot be determined (neutral). Your answer must be in the form of the letters E, C, and N respectively.

Sentence 1: A man with black hair and gray pants is standing holding a helmet and looks very dirty. Sentence 2: A man is not clean
C

Sentence 1: During karate practice, one student kicks through a wooden plank while another individual holds it at face-height. Sentence 2: The students are exercising indoors.
N

Sentence 1: A man with a red and gray shirt walking, and looking down. Sentence 2: A man sitting on a curb.

C