https://www.votingtheory.org/forum/topic/476/the-alaskan-top-four-model-iebs brings up a framework in which there are two ballotings to fill a single-winner office. Four or five candidates are to advance to the second balloting. The post asks, among other things, what voting system should be used for the first balloting. This is, in a sense, a multiwinner election. Can a system be chosen with an objective of making it unlikely that clones will advance and crowd down the real choices remaining for the final balloting?