instruction:
In this task, you're given a pair of sentences, sentence 1 and sentence 2. Your job is to determine if the two sentences clearly agree/disagree with each other, or if this can't be determined. Indicate your answer as yes or no respectively.
question:
Sentence 1: A rock inscription from Emperor Ashoka indicates that Delhi was a major point on the trade route between the northwest frontier and Bengal in the third century b.c. Sentence 2: Delhi was not a point of trade until the 5th century AD, according to the rock inscription.
answer:
yes


question:
Sentence 1: But Sir James was already on the topmost stair. Sentence 2: They were telling Sir James to come upstairs, not realizing he was already there.
answer:
no


question:
Sentence 1: The system is the UPC or in the case of books a EAN/ISBN number that when a book is scanned by a retailer identifies the book, format, suggested price point, genre, etc. --Tom Fogarty, Soundscan executive in charge of Bookscan. Sentence 2: Tom Fogarty does not believe that UPC is used in the retail sphere. 
answer:

yes