you are likely to find Arm in/at/on Jacket. Arm is a type of Limb. 
Rear is a type of Straighten. Rear is a different concept from Front. Front is related to Lawn. 
Jacket <--AtLocation-- Arm --IsA--> Limb 
Straighten <--IsA-- Rear <--DistinctFrom--> Front <--RelatedTo--> Lawn 