83. (1) After the ballot papers have been mixed in accordance with rule 79, the returning officer shall, rejecting any that are invalid, arrange them in parcels according to the first preferences recorded for each candidate.

(2) The returning officer shall then count the number of papers in each parcel and credit each candidate with a number of votes equal to the number of valid papers on which a first preference has been recorded for such candidate and the returning officer shall ascertain the number of all valid papers.