Discussion is related to Issue. Issue is related to Solution. 
Big is related to Government. Government is related to District. District is related to Certain. Certain is similar to Reliable. 
Discussion <--RelatedTo--> Issue <--RelatedTo--> Solution 
Big <--RelatedTo--> Government <--RelatedTo--> District <--RelatedTo--> Certain <--SimilarTo--> Reliable 