Barrel is related to Gun. Gun is related to Deadly. Deadly is derived from Death. Death is related to Desert. 
Tail is related to Pig. Pig is related to Bank. Bank is related to Financial. Financial is related to Pay. 
Barrel <--RelatedTo--> Gun <--RelatedTo--> Deadly --DerivedFrom--> Death <--RelatedTo--> Desert 
Tail <--RelatedTo--> Pig <--RelatedTo--> Bank <--RelatedTo--> Financial <--RelatedTo--> Pay 