Optimistic is related to Positive. Positive is related to Hope. 
Pipe is related to Implement. Implement is related to Glass. Glass is related to See. See is related to Distinguish. 
Optimistic <--RelatedTo--> Positive <--RelatedTo--> Hope 
Pipe <--RelatedTo--> Implement <--RelatedTo--> Glass <--RelatedTo--> See <--RelatedTo--> Distinguish 