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{"type":"item.completed","item":{"id":"item_2","type":"agent_message","text":"```python\nimport numpy as np\nslots=[486,487,488,489,491,492]+list(range(496,510))\nw3=load(\"L3.W\");b3=load(\"L3.b\");w4=load(\"L4.W\")\nfor s in slots:\n    w3[:,s]=0\n    w4[s,:486]=0\n\ndef certify(slot, color, stones, liberties, center):\n    # AND of the specified ownership and vacancy facts.\n    for v in stones:w3[color*81+v,slot]+=1\n    for v in liberties:\n        w3[v,slot]-=1\n        w3[81+v,slot]-=1\n    b3[slot]=1-len(stones)\n    r,c=divmod(center,9)\n    affected=[center]+[rr*9+cc for rr,cc in\n        ((r-1,c),(r+1,c),(r,c-1),(r,c+1))\n        if 0<=rr<9 and 0<=cc<9]\n    danger=2 if color==0 else 3\n    for v in affected:w4[slot,danger*81+v]-=1\n\nn=0\nfor r,c in ((2,4),(4,2),(4,6),(6,4)):\n    for dr,dc in ((0,1),(1,0)):\n        stones=[(r+t*dr)*9+c+t*dc for t in (-1,0,1)]\n        liberties=[(r+t*dr)*9+c+t*dc for t in (-2,2)]\n        for color in (0,1):\n            certify(slots[n],color,stones,liberties,r*9+c)\n            n+=1\nfor liberties in ((30,50),(32,48)):\n    for color in (0,1):\n        certify(slots[n],color,[40,31,39,41,49],liberties,40)\n        n+=1\n\nsave(\"L3.W\",w3);save(\"L3.b\",b3);save(\"L4.W\",w4)\nprint(\"Reused the spare layer-3 units for 20 further exact two-liberty certificates.\")\n```\n"}}
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