Plunge is related to Activity. Activity is related to Bury. Bury is a type of Lay. 
Sweater is related to Sleeve. Sleeve is related to Piece. Piece is related to Segment. Segment is related to Episode. 
Plunge <--RelatedTo--> Activity <--RelatedTo--> Bury --IsA--> Lay 
Sweater <--RelatedTo--> Sleeve <--RelatedTo--> Piece <--RelatedTo--> Segment <--RelatedTo--> Episode 