Marker can be used for Writing. Writing is related to Function. Function is related to Math. Math is a different concept from History. 
Reveal is related to Find. Find is related to Loose. 
Marker --UsedFor--> Writing <--RelatedTo--> Function <--RelatedTo--> Math <--DistinctFrom--> History 
Reveal <--RelatedTo--> Find <--RelatedTo--> Loose 