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 Sudoku Solution Path    R1C7 is the only square in row 1 that can be <3> R2C4 is the only square in row 2 that can be <1> R4C8 is the only square in row 4 that can be <1> R4C9 is the only square in row 4 that can be <3> R5C6 is the only square in row 5 that can be <3> R6C2 is the only square in row 6 that can be <4> R7C1 is the only square in row 7 that can be <3> R8C6 is the only square in row 8 that can be <9> R6C9 is the only square in row 6 that can be <9> R8C1 is the only square in row 8 that can be <6> R4C3 is the only square in row 4 that can be <6> R5C8 is the only square in row 5 that can be <6> R2C9 is the only square in row 2 that can be <6> R6C8 is the only square in column 8 that can be <8> R1C6 is the only square in column 6 that can be <8> R4C1 is the only square in column 1 that can be <8> R5C4 is the only square in row 5 that can be <8> R1C3 is the only square in block 1 that can be <9> Squares R5C7 and R6C7 in column 7 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 column.    R9C7 - removing <5> from <145> leaving <14> Squares R2C8 and R3C9 in block 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <25>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R1C8 - removing <25> from <2457> leaving <47>    R3C8 - removing <25> from <2457> leaving <47> R2C8 is the only square in column 8 that can be <5> R3C9 can only be <2> R8C8 is the only square in column 8 that can be <2> R8C2 can only be <1> R8C7 can only be <4> R9C7 can only be <1> R7C6 is the only square in row 7 that can be <1> Squares R2C2 and R2C3 in block 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <28>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the block.    R1C1 - removing <2> from <257> leaving <57> R6C1 is the only square in column 1 that can be <2> R6C6 can only be <5> R5C3 can only be <7> R6C7 can only be <7> R3C6 can only be <6> R4C4 can only be <9> R5C7 can only be <5> R9C6 can only be <2> R4C2 can only be <5> R5C5 can only be <2> R7C5 can only be <5> R5C2 can only be <9> R7C9 can only be <8> R1C5 can only be <4> R9C9 can only be <5> R9C3 can only be <8> R7C4 can only be <7> R1C8 can only be <7> R3C5 can only be <9> R9C5 can only be <6> R3C4 can only be <5> R1C1 can only be <5> R3C8 can only be <4> R3C1 can only be <7> R1C4 can only be <2> R7C2 can only be <2> R9C4 can only be <4> R9C2 can only be <7> R2C3 can only be <2> R2C2 can only be <8>