(a) the first call for nominations for an employee representative and an employer representative shall only include nominations of representatives who represent participating bodies which are villages, and the election of these representatives shall be held immediately after their nominations have closed;

(b) the second call for nominations for an employer representative and an employee representative shall only include nominations of representatives who represent participating bodies which are towns, and the election of these representatives shall be held immediately after their nominations have closed;

(c) the third call for nominations for an employer representative and an employee representative shall only include nominations of representatives who represent participating bodies which are towns, villages or bodies other than municipalities, unless any of the participating bodies is a city or a rural community, in which case nominations shall only include nominations of representatives who represent participating bodies which are cities or rural communities, and the election of these representatives shall be held immediately after their nominations have closed; and

(d) if insufficient representatives have been elected to satisfy the requirements of subsection 16(3), a fourth call for nominations shall be held for an employer representative or an employee representative, as the case may be, which shall include nominations of representatives from any participating body, and the election of this representative shall be held immediately after the nominations have closed.