Mind is related to Conscience. Conscience is related to Voice. Voice is related to Ring. Ring can be used for Engage. 
Contract is a synonym of Reduce. Reduce is related to Ecological. 
Mind <--RelatedTo--> Conscience <--RelatedTo--> Voice <--RelatedTo--> Ring --UsedFor--> Engage 
Contract <--Synonym--> Reduce <--RelatedTo--> Ecological 