In his Matching Soulmates paper in the journal of Public Economic Theory, everyone is in a computer simulated dating pool, where thousands of digitally created daters rank each other. His algorithm picks "first‑order soulmates": pairs who choose each other in a stable matching. It removes them, and runs it again with those left, and you get second‑order soulmates, and so on.
第三十三条 国务院财政、税务主管部门应当适时研究和评估增值税优惠政策执行效果，对不再适应国民经济和社会发展需要的优惠政策，及时报请国务院予以调整完善。
，这一点在Line官方版本下载中也有详细论述
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