Support/Include/Reject voting

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Support/Include/Reject (SIR) voting works as follows:

Voters can Support, Include, or Reject each candidate. Find the two candidates rejected by the fewest voters; of these two, the one who's supported by the most voters wins.

There is an option on the ballot that a voter can check so that all their blank votes count as "Reject". If a voter does not choose this option, their blank votes count for a given candidate count as "Include" for a number of voters equal to the number of voters who supported that candidate; and then as "Reject" for all further blank votes. In this way, blanks for a well-liked candidate mostly count as "Include", but blanks for relatively unknown candidate mostly count as "Reject".