Excuse is a type of Note. Note is related to Component. Component is related to Cell. Cell is a type of Film. 
Fool is related to Play. Play is related to Entertainment. Vacation can be used for Entertainment. Vacation is related to Summer. 
Excuse --IsA--> Note <--RelatedTo--> Component <--RelatedTo--> Cell --IsA--> Film 
Fool <--RelatedTo--> Play <--RelatedTo--> Entertainment <--UsedFor-- Vacation <--RelatedTo--> Summer 