When the reception of illegal votes is alleged as a cause of
contest, it is sufficient to state generally that in one or more
specified voting precincts illegal votes were given to the defendant,
which, if taken from him or her, will reduce the number of his or
her legal votes below the number of legal votes given to some other
person for the same office.
   Testimony shall not be received of any illegal votes, unless the
contestant delivers to the defendant, at least three days before the
trial, a written list of the number of illegal votes, and by whom
given, which he or she intends to prove. No testimony may be received
of any illegal votes except those that are specified in the list.