Mail is related to Service. Service is a type of Employment. Employment is related to Company. Company have Earnings. 
Convinced is a synonym of Confident. Confident is related to Certain. Certain is related to Level. 
Mail <--RelatedTo--> Service --IsA--> Employment <--RelatedTo--> Company --HasA--> Earnings 
Convinced <--Synonym--> Confident <--RelatedTo--> Certain <--RelatedTo--> Level 