Adventure is related to Holiday. Holiday is related to Sale. Sale is related to Discount. 
Drain is a type of Tube. Tube is a type of Bring. Bring is related to Gather. Gathering is a form of Gather. 
Adventure <--RelatedTo--> Holiday <--RelatedTo--> Sale <--RelatedTo--> Discount 
Drain --IsA--> Tube --IsA--> Bring <--RelatedTo--> Gather <--FormOf-- Gathering 