May is related to Shall. Shall is related to Must. Must is related to Demand. 
Manufacturer is a synonym of Producer. Producer is related to Factory. Factory is related to Produce. Productivity is derived from Produce. 
May <--RelatedTo--> Shall <--RelatedTo--> Must <--RelatedTo--> Demand 
Manufacturer <--Synonym--> Producer <--RelatedTo--> Factory <--RelatedTo--> Produce <--DerivedFrom-- Productivity 