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deleteExercise(ident uid, ident id) { assume exists //accounts/account[uid]/admin; assume exists //exercises/exercise[id]; assume size(//exercises/exercise[id]/assistant[id]) = 0; assume size(//exercises/exercise[id]/groups/group/tutor[id]) = 0; assume size(//exercises/exercise[id]/students/student) = 0; # don't allow to delete if students are there remove //exercises/exercise[id]; }