Instruction: Check the details of the two products to see if they refer to the same product. Output only yes or no.

Input:
Product 1:
title: great invasions
description: great invasions plunges you back into the dark age of europe when barbarian tribes and nation states quarreled & warred. lead armies in the epic conquest of europe -- by force or diplomacy your dominance must be established. conquer your opponents as the fate of the western world unfolds! multiplayer...
manufacturer: strategy first
price: 39.99

Product 2:
title: strategy first inc. great invasions
description: great invasions plunges you back into the dark age of europe when barbarian tribes and nation states quarreled & warred. lead armies in the epic conquest of europe -- by force or diplomacy your dominance must be established. conquer your opponents ...
manufacturer: nan
price: 34.07
Answer: yes