http://morfizm.livejournal.com/ ([identity profile] morfizm.livejournal.com) wrote in [personal profile] ermouth 2016-08-18 10:51 pm (UTC)

Sorry, я идиот. Не "какие-то два", а "любые два" пересекаются. Мой контрпример не годится. ОК буду думать.
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