bodge E1, C6, and C8; fix C13 answer coding
bodge E1, C6, and C8; fix C13 answer coding

cmu-delphi/delphi-epidata,cmu-delphi/delphi-epidata,cmu-delphi/delphi-epidata,cmu-delphi/delphi-epidata,cmu-delphi/delphi-epidata,cmu-delphi/delphi-epidata