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 Sudoku Solution Path   R3C6 can only be <5> R6C7 can only be <6> R7C4 can only be <2> R9C1 can only be <6> R5C4 can only be <4> R7C2 can only be <1> R8C4 can only be <3> R8C8 is the only square in row 8 that can be <1> R2C6 is the only square in column 6 that can be <1> R1C5 can only be <3> R2C5 can only be <2> R6C5 can only be <1> R4C5 can only be <9> R5C6 can only be <2> R1C1 is the only square in row 1 that can be <1> R2C2 is the only square in row 2 that can be <3> R4C3 is the only square in row 4 that can be <1> R1C2 is the only square in column 2 that can be <6> R2C3 is the only square in column 3 that can be <5> R9C8 is the only square in column 8 that can be <2> R9C2 can only be <4> R9C5 can only be <5> R9C9 can only be <3> R8C5 can only be <4> R5C8 is the only square in row 5 that can be <3> Squares R1C8 and R1C9 in block 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R2C8 - removing <7> from <46789> leaving <4689>    R2C9 - removing <7> from <678> leaving <68>    R3C8 - removing <7> from <789> leaving <89> R1C9 is the only square in column 9 that can be <7> R1C8 can only be <5> Squares R6C3, R8C3, R6C2 and R8C2 form a Type-2 Unique Rectangle on <27>.    R5C2 - removing <8> from <589> leaving <59> Squares R3C2<79>, R4C2<57> and R5C2<59> in column 2 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <579>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R6C2 - removing <7> from <278> leaving <28>    R8C2 - removing <7> from <278> leaving <28> The puzzle can be reduced to a Bivalue Universal Grave (BUG) pattern, by making this reduction:    R2C8=<46> These are called the BUG possibilities. In a BUG pattern, in each row, column and block, each unsolved possibility appears exactly twice. Such a pattern either has 0 or 2 solutions, so it cannot be part of a valid Sudoku When a puzzle contains a BUG, and only one square in the puzzle has more than 2 possibilities, the only way to kill the BUG is to remove both of the BUG possibilities from the square, thus solving it    R2C8 - removing <46> from <4689> leaving <89> R2C7 is the only square in row 2 that can be <4> R4C7 can only be <5> R4C2 can only be <7> R8C7 can only be <9> R5C9 can only be <8> R5C1 can only be <9> R2C9 can only be <6> R6C8 can only be <7> R6C3 can only be <2> R4C8 can only be <4> R8C6 can only be <6> R7C8 can only be <6> R8C9 can only be <5> R3C2 can only be <9> R5C2 can only be <5> R2C1 can only be <7> R6C2 can only be <8> R8C3 can only be <7> R7C6 can only be <9> R8C1 can only be <8> R2C4 can only be <8> R2C8 can only be <9> R3C4 can only be <7> R3C8 can only be <8> R8C2 can only be <2>

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