koyy on Nostr: 2桁×2桁の掛け算って頭の中に四角形浮かぶよね？浮かばない？
2桁×2桁の掛け算って頭の中に四角形浮かぶよね？浮かばない？
Published at
2026-10-27 12:28:31 UTCEvent JSON
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