Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: are they sold by the box? and how many pre. box.
Document: flat no concave, just didnt like it
My husband has been skating for years and said its great quality for the price. Its a solid board, sealed nicely
Answer: no