Physics is related to Class. Class is related to Drama. Comedy is a type of Drama. 
Operation is a type of Work. Work is a type of Go. Go is related to Steady. Steady is related to Balance. 
Physics <--RelatedTo--> Class <--RelatedTo--> Drama <--IsA-- Comedy 
Operation --IsA--> Work --IsA--> Go <--RelatedTo--> Steady <--RelatedTo--> Balance 