(1) It shall be the function of a Constituency Commission to make a report in relation to the constituencies for-
(a) the election of members to the Dáil, and
(b) the election of members of the European Parliament.
(2) In preparing a report under subsection (1)(a) a Constituency Commission shall, in observing the relevant provisions of the Constitution in relation to Dáil constituencies, have regard to the following:
(a) the total number of members of the Dáil, subject to Article 16.2.2° of the Constitution, shall be not less than 166 and not more than 172;
(b) each constituency shall return 3, 4 or 5 members;
(c) the breaching of county boundaries shall be avoided as far as practicable;
(d) each constituency shall be composed of contiguous areas;
(e) there shall be regard to geographic considerations including significant physical features and the extent of and the density of population in each constituency; and
(f) subject to the provisions of this section, the Commission sh