There may be paid into a client account -
(a) trust money;
(b) such money belonging to the solicitor as may be necessary for the purpose of opening or maintaining the account;
(c) money to replace any sums which may by mistake or accident have been drawn from the account in contravention of subrule (2) of rule 8; and
(d) a cheque or draft received by the solicitor which under rule 5 he is entitled to split but which he does not split.