Hidden is related to Shade. Shade is related to Cloth. Cloth is related to Flag. Flag is related to Representation. 
Refrigerator is related to Storage. Trunk can be used for Storage. Trunk is part of Automobile. Automobile is similar to Trailer. 
Hidden <--RelatedTo--> Shade <--RelatedTo--> Cloth <--RelatedTo--> Flag <--RelatedTo--> Representation 
Refrigerator <--RelatedTo--> Storage <--UsedFor-- Trunk --PartOf--> Automobile <--SimilarTo--> Trailer 