you are likely to find Piece in/at/on Puzzle. Piece is related to Portion. Portion is related to Slice. 
Helicopter can be used for Fly. Fly is related to Small. 
Puzzle <--AtLocation-- Piece <--RelatedTo--> Portion <--RelatedTo--> Slice 
Helicopter --UsedFor--> Fly <--RelatedTo--> Small 