(3) The return mailing envelope shall contain a statement in substantially the following form:
VOTER'S CERTIFICATE
I, (Print Name) , do solemnly swear (or affirm) that I am a qualified voter in this election and that I have not and will not vote more than one ballot in this election.
I understand that failure to sign this certificate and give my residence address will invalidate my ballot.
(Signature)
(Residence Address)