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changeResult(ident uid, ident id, ident studentId, ident sheetId, double points) { assume exists //accounts/account[uid]/assistant[id] || exists //accounts/account[uid]/tutor[id]/group[//exercises/exercise[id]/students/student[studentId]/group]; assume exists //exercises/exercise[id]/students/student[studentId]; # implies the existence of the exercise assume exists //exercises/exercise[id]/sheets/sheet[sheetId]; # dito assume points >= 0 && points <= //exercises/exercise[id]/sheets/sheet[sheetId]/maxPoints; assume exists //exercises/exercise[id]/students/student[studentId]/result[sheetId]; update //exercises/exercise[id]/students/student[studentId]/result[sheetId]/points points; }