Mountain is related to Trail. Trail is a type of Protein. Rank is a type of Protein. 
Expense is related to Report. Report is related to Home. Home is related to Call. Call is related to Number. 
Mountain <--RelatedTo--> Trail --IsA--> Protein <--IsA-- Rank 
Expense <--RelatedTo--> Report <--RelatedTo--> Home <--RelatedTo--> Call <--RelatedTo--> Number 