Reading is related to Brain. Brain is a type of Organ. Organ is a type of Instrument. Guitar is a type of Instrument. 
you are likely to find Wound in/at/on Body. Wound is related to Bloody. 
Reading <--RelatedTo--> Brain --IsA--> Organ --IsA--> Instrument <--IsA-- Guitar 
Body <--AtLocation-- Wound <--RelatedTo--> Bloody 