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signUpGroup(ident id, ident studentId, ident groupId) { assume exists //exercises/exercise[id]/students/student[studentId]; # implies the existence of the exercise assume exists //exercises/exercise[id]/groups/group[groupId]; # also implies it, but once is really enough assume not exists //exercises/exercise[id]/students/student[studentId]/group; assume count(groupId, //exercises/exercise[id]/students/student/group) < //exercises/exercise[id]/groups/group[groupId]/maxSize; insert //exercises/exercise[id]/students/student[studentId]/group groupId; } # roles: assistant[id]