Custom is related to Import. Import is related to Advantage. Advantage is related to Bonus. 
you are likely to find Painter in/at/on Ladder. you are likely to find Ladder in/at/on Roof. Roof is part of Cave. Cave can be used for Exploration. 
Custom <--RelatedTo--> Import <--RelatedTo--> Advantage <--RelatedTo--> Bonus 
Painter --AtLocation--> Ladder --AtLocation--> Roof --PartOf--> Cave --UsedFor--> Exploration 