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 Sudoku Solution Path   R5C8 can only be <4> R7C9 is the only square in row 7 that can be <1> R1C7 is the only square in row 1 that can be <1> R8C1 is the only square in row 8 that can be <1> R5C2 is the only square in row 5 that can be <1> R6C4 is the only square in column 4 that can be <4> R5C5 is the only square in column 5 that can be <3> R3C6 is the only square in column 6 that can be <2> Intersection of column 4 with block 2. The value <6> only appears in one or more of squares R1C4, R2C4 and R3C4 of column 4. These squares are the ones that intersect with block 2. Thus, the other (non-intersecting) squares of block 2 cannot contain this value.    R1C5 - removing <6> from <5689> leaving <589> Squares R1C5, R2C4 and R2C5 in block 2 form a simple locked triplet. These 3 squares all contain the 3 possibilities <589>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R1C4 - removing <589> from <56789> leaving <67>    R3C4 - removing <5> from <567> leaving <67> R3C1 is the only square in row 3 that can be <5> R9C1 is the only square in column 1 that can be <3> R7C3 can only be <7> R8C3 can only be <9> R9C3 can only be <2> R9C2 can only be <8> R1C3 can only be <4> R2C3 can only be <3> R3C2 can only be <7> R3C4 can only be <6> R3C7 can only be <3> R1C4 can only be <7> R6C2 is the only square in row 6 that can be <3> R7C8 is the only square in row 7 that can be <3> R1C1 is the only square in column 1 that can be <8> Squares R8C5 and R8C8 in row 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <68>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R8C6 - removing <8> from <478> leaving <47>    R8C7 - removing <68> from <4678> leaving <47> R8C8 is the only square in block 9 that can be <8> R8C5 can only be <6> R2C5 is the only square in column 5 that can be <8> Squares R7C4 and R7C6 in block 8 form a simple locked pair. These 2 squares both contain the 2 possibilities <58>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R9C5 - removing <5> from <59> leaving <9>    R9C6 - removing <5> from <4579> leaving <479> R1C5 can only be <5> R1C9 can only be <6> R2C4 can only be <9> R1C8 can only be <2> R6C9 can only be <9> R2C2 can only be <2> R5C9 can only be <7> R1C2 can only be <9> R4C8 can only be <6> R2C7 can only be <4> R2C9 can only be <5> R8C7 can only be <7> R4C3 can only be <5> R9C8 can only be <5> R6C7 can only be <8> R5C1 can only be <9> R9C9 can only be <4> R6C6 can only be <5> R4C7 can only be <2> R8C6 can only be <4> R9C7 can only be <6> R9C6 can only be <7> R4C4 can only be <8> R6C3 can only be <6> R4C6 can only be <9> R7C4 can only be <5> R4C1 can only be <7> R7C6 can only be <8>

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