Instruction: Evaluate each product title in the given list, assess its relevance to the given query, and then arrange the products in descending order of relevance, with the most relevant product at the top of the ranked list.

Input:
Query: pecs communication book
Product list:
A: Plastic Visual ASD Now, Next and Later Board (Picture Communication Symbols)
B: Activity Binder: Picture Exchange Communication System (PECS)
Answer: B,A