(l) The select list as finally approved by the Government, will be the list for promotion of the members of the service from the post shown in columh (2)of Schedule IVto the post shown in column (3) of the said Schedule. . \
(2)The select list shall ord~arily be illforce period until it is reviewedor revised in accordance with sub-rule (4)of rule 15but its validity shall not be extended beyond a total period of 18months from the.date ofits preparation: __
Provided that in the event of a grave lap$e in the conduct of perf9rmance of duties on the part of any person includeD in the select list, a .special review of the select list may be made at the instance of. the Government and the Commission may, if it thinks fit, remove the name of such person from the select list. . . .