Commitment is a type of Cooperation. Commitment is a synonym of Guarantee. Secure is a type of Guarantee. Secure is related to Lock. 
Economic is related to Depression. Depression is related to Condition. Difficulty is a type of Condition. 
Cooperation <--IsA-- Commitment <--Synonym--> Guarantee <--IsA-- Secure <--RelatedTo--> Lock 
Economic <--RelatedTo--> Depression <--RelatedTo--> Condition <--IsA-- Difficulty 