one thing you do when you Learning is Listen. the last thing you do when you Listen is Relax. the last thing you do when you Clean is Relax. Clean is a synonym of Blank. 
Happy is related to Attitude. Attitude is related to Opinion. 
Learning --HasSubevent--> Listen --HasLastSubevent--> Relax <--HasLastSubevent-- Clean <--Synonym--> Blank 
Happy <--RelatedTo--> Attitude <--RelatedTo--> Opinion 