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).

Entity 1: matrix 
 Entity 2: cellulose fibre
yes

Entity 1: laser 
 Entity 2: convection current
no

Entity 1: envelope 
 Entity 2: electrolyte

no