that the arbitrator was ineligible for appointment to the Tribunal pursuant to

Rule 21(2)(a)

-(c); or

that circumstances exist that give rise to justifiable doubts as to the qualities of the arbitrator required by

Rule 22

.

the proposal shall be filed after the constitution of the Tribunal and within 21 days after the later of:

the proposal shall include the grounds on which it is based, a statement of the relevant facts, law and arguments, and any supporting documents;

the other party shall file its response and any supporting documents within 21 days after receipt of the proposal;

the arbitrator to whom the proposal relates may file a statement that is limited to factual information relevant to the proposal. The statement shall be filed within five days after the earlier of receipt of the response or expiry of the time limit referred to in

paragraph (2)(c)

; and

each party may file a final written submission on the proposal within seven days after the earlier of receipt of the statement or expiry of the time limit referred to in

paragraph (2)(d)

.