TASK DEFINITION: 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).
PROBLEM: Entity 1: phosphate 
 Entity 2: forelimb

SOLUTION: no

PROBLEM: Entity 1: tube 
 Entity 2: mantle

SOLUTION: no

PROBLEM: Entity 1: mouth 
 Entity 2: jaw

SOLUTION:
yes