4000.42—What definitions do I need to know for these rules?
         You need to know two definitions from  § 4001.2 of this chapter: PBGC and person. You also need to know the following definitions:
    
    
        
            Business day means a day other than a Saturday, Sunday, or Federal holiday.
    
    
        
            We means the PBGC.
    
    
        
            You means the person responsible, under our regulations, for the filing or issuance to which these rules apply.