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Random Version 2 BTC Puzzles: 71 ON | OFF / 72 ON | OFF / 73 ON | OFF / 74 ON | OFF / 76 ON | OFF / 77 ON | OFF / 78 ON | OFF / 79 ON | OFF / 81 ON | OFF / 82 ON | OFF / 83 ON | OFF / 84 ON | OFF / 86 ON | OFF / 87 ON | OFF / 88 ON | OFF / 71–160 ON | OFF |