Given two entities as input, classify as "yes" if second entity is the part of the first entity. Otherwise classify them as "no". These are entities of meronym In linguistics, meronymy is a semantic relation between a meronym denoting a part and a holonym denoting a whole. In simpler terms, a meronym (i.e., second entity) is in a part-of relationship with its holonym (i.e., first entity).

Q: Entity 1: ray 
 Entity 2: substance

A: no
****
Q: Entity 1: downy woodpecker 
 Entity 2: stolon

A: no
****
Q: Entity 1: snake 
 Entity 2: prehensile tail

A:
yes
****