incomplete fix; forgot that used_sub is distinct from submission
incomplete fix; forgot that used_sub is distinct from submission

blerner/bottlenose,blerner/bottlenose,CodeGrade/bottlenose,blerner/bottlenose,NatTuck/bottlenose,NatTuck/bottlenose,CodeGrade/bottlenose,NatTuck/bottlenose,CodeGrade/bottlenose,CodeGrade/bottlenose,blerner/bottlenose,blerner/bottlenose,NatTuck/bottlenose,NatTuck/bottlenose,blerner/bottlenose,CodeGrade/bottlenose,NatTuck/bottlenose,CodeGrade/bottlenose,blerner/bottlenose,CodeGrade/bottlenose