Definition: Given Sentence 1 and Sentence 2, indicate your answer as yes when the two sentences clearly agree or clearly disagree with each other. If the relationship cannot be determined, answer with 'no'.

Positive Example 1 -
Input: A boy in a blue jacket rides a skateboard down the street. <sep> A blue jacketed boy is standing in football field.
Output: yes

Positive Example 2 -
Input: A large group of people gather at a piano bar. <sep> A group of men at a piano bar
Output: no

Negative Example 1 -
Input: There are two young ladies jogging, by the ocean side. <sep> Two women are running late for a meeting.
Output: yes

Negative Example 2 -
Input: A man and a woman are on a seesaw. <sep> Two adults on a seesaw.
Output: no

Now complete the following example -
Input: a skier is throwing up snow as he skis off piste. <sep> A professional skier skis down a mountain.
Output: 


Output: no