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addParticipant(ident id, ident studentId) {
  assume exists //exams/exam[id]; # implicitly true in OO implementations
  assume exists //accounts/account/student[studentId];
 
  assume not exists //exams/exam[id]/results/participant[studentId];
 
  insert //exams/exam[id]/results/participant[studentId];
} # roles: examiner[id]