When as to any candidate or any submitted or referred question a petition or petitions are filed under § 12-21-8 as to any particular precinct or precincts within a county, similar petitions as to the same question or candidate may be filed within three days thereafter as to another precinct or precincts within the county, even though the specified period of ten days from the election expires within such three days. But such three–day extension shall only apply as from the filing of the first petition as to any such candidate or any such question.

Source: SDC 1939, § 16.1803 (1).