With reference to his replies to questions 617, 618 and 619 on 7 May 2018, what is the (a) total number of posts of each specified profession (details furnished) that are vacant in each district municipality in Mpumalanga and (b)(i)(aa) name and (bb) location of each institution and (ii)(aa) duration of each vacancy and (bb) date by which each vacancy is envisaged to be filled?