[21] On my reading of s. 5.2(2), however, there is no discretion to fail to invite applications, to select on any basis other than the merit of the applicants, or to prevent unjust discrimination whether in favour of or against a person. It may be accepted that there is some discretion as to procedural matters such as time limits and the place at which and the way in which applicants are interviewed, but such procedures too must pass the test of being fair and equitable. Some flexibility may then be permitted in devising appropriate procedures for deciding upon applications but there is no power to dispense with the three requirements set out in s. 5.2(a) and (b). Furthermore, once it is accepted that merit must be the basis of selection it follows that by operation of s. 5.2(5) and (6) all of the performance and experience of an officer must be taken into account. To exclude part of the history of the performance and experience of an officer would lead to the absurd result that outstanding performance and experience could be ignored in some cases and misconduct or indifferent performance in others. That cannot have been, and I think manifestly was not, the intention of the legislature; nor can it have been the intention of the legislature to permit selection on any basis other than merit.