INTERNATIONAL SEARCH REPORT International application No PCT/EP2019/070038 A. CLASSIFICATION OF SUBJECT MATTER INV. G06F17/50 ADD. According to International Patent Classification (IPC) or to both national classification and IPC B. FIELDS SEARCHED Minimum documentation searched (classification system followed by classification symbols) G06F Documentation searched other than minimum documentation to the extent that such documents are included in the fields searched Electronic data base consulted during the international search (name of data base and, where practicable, search terms used) EPO-Internal , COMPENDEX, INSPEC, IBM-TDB