Effort is a type of Labor. Trouble is a type of Effort. Matter is a type of Trouble. 
Instrument is a type of Assistant. Instrument is related to Bed. Bed is related to Tuck. 
Labor <--IsA-- Effort <--IsA-- Trouble <--IsA-- Matter 
Assistant <--IsA-- Instrument <--RelatedTo--> Bed <--RelatedTo--> Tuck 