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I would first check if Sakuramoria has an antitrust law.
If it does, I would point out that it is not being followed, as contracts for exclusive supply would clearly contradict it.
If not, I would formulate and issue one.
Even without antitrust laws, government contracts cannot be restricted by agreements between an organization and a third party, under normal legislation; otherwise, it poses a direct threat to security. This can also be monitored separately to ensure that such practices are prohibited.