Example question

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body Spreadsheet_Task is
    begin
        loop
            select
                accept Recalculate;
                Do_Recalculation;
            or
                accept Shutdown;
                exit;
            end select;
        end loop;
    end Spreadsheet_Task;

Tutorial says "If calls to both entries are already pending, one will be accepted non-deterministically." what does that mean? If calls are pending on bith entries it might happend that Shutdown is accepted and exits in which case thats not good solution at all