Tissue is related to Bone. Bone is related to Specialty. Specialty is derived from Special. Special is related to Card. 
Roof is related to Cottage. Cottage is related to Cabin. 
Tissue <--RelatedTo--> Bone <--RelatedTo--> Specialty --DerivedFrom--> Special <--RelatedTo--> Card 
Roof <--RelatedTo--> Cottage <--RelatedTo--> Cabin 