Write in votes

[DEMOREP1]

Mr. Saari wrote:
I do not believe it is possible to include write-in votes in any ranked voting
scheme - because there is no data whatsoever regarding that particular write-
in candidate on the OTHER ballots, so the tallying method is not definable.
(Is this true?  Perhaps not?)

D-  single office, 1,000 voters, 501 voters vote

A.B.    on ballot   5
C.D     on ballot   3
E.F.     on ballot   4
W.X.    write-in   1
Y.Z.     write-in   2

I assume W.X. wins.