Pool is related to Swim. Swim is related to Butterfly. Butterfly is related to Bug. Bug is related to Size. 
Certain is related to True. True is related to Actual. 
Pool <--RelatedTo--> Swim <--RelatedTo--> Butterfly <--RelatedTo--> Bug <--RelatedTo--> Size 
Certain <--RelatedTo--> True <--RelatedTo--> Actual 