http://mmekourdukova.livejournal.com/ ([identity profile] mmekourdukova.livejournal.com) wrote in [personal profile] mareicheva_olga 2017-02-20 07:46 pm (UTC)

Эти мутации логических задач известны ещё со времен поручика Ржевского, напр., задача о херувиме и парикмахере.
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