Charter is a type of Document. Charter is a type of License. Franchise is a type of License. 
Impulse is etymologically related to Pulse. Pulse is related to Shock. Shock is related to Stimulus. 
Document <--IsA-- Charter --IsA--> License <--IsA-- Franchise 
Impulse --EtymologicallyRelatedTo--> Pulse <--RelatedTo--> Shock <--RelatedTo--> Stimulus 