http://olenaageyeva_1.livejournal.com/ ([identity profile] olenaageyeva-1.livejournal.com) wrote in [personal profile] green_fr 2014-02-05 01:31 pm (UTC)

У меня заняло некоторое время понять про четырехмероный куб... интересно, в каком возрасте это сможет понять ребенок?
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