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 Sudoku Solution Path   R3C3 can only be <8> R3C7 can only be <5> R5C7 can only be <2> R7C3 can only be <9> R7C5 can only be <5> R3C5 can only be <7> R7C7 can only be <1> R5C9 can only be <7> R5C3 can only be <6> R1C1 is the only square in row 1 that can be <5> R2C8 is the only square in row 2 that can be <7> R4C4 is the only square in row 4 that can be <2> R9C8 is the only square in row 9 that can be <8> R8C1 is the only square in column 1 that can be <7> R8C9 is the only square in column 9 that can be <5> Squares R5C4 and R5C6 in row 5 form a simple locked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R5C5 - removing <4> from <349> leaving <39> Squares R6C4 and R6C8 in row 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <56>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R6C5 - removing <6> from <136> leaving <13>    R6C6 - removing <5> from <157> leaving <17> Squares R5C6 and R8C6 in column 6 form a simple locked pair. These 2 squares both contain the 2 possibilities <48>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R2C6 - removing <4> from <145> leaving <15> Squares R5C4, R5C6, R8C4 and R8C6 form a Type-1 Unique Rectangle on <48>.    R8C4 - removing <48> from <468> leaving <6> R8C2 can only be <3> R6C4 can only be <5> R9C5 can only be <4> R9C9 can only be <3> R1C5 can only be <1> R8C6 can only be <8> R9C1 can only be <2> R8C8 can only be <4> R1C2 can only be <2> R6C5 can only be <3> R2C6 can only be <5> R2C4 can only be <4> R4C6 can only be <7> R4C2 can only be <9> R6C6 can only be <1> R6C8 can only be <6> R6C2 can only be <7> R5C5 can only be <9> R4C8 can only be <5> R5C6 can only be <4> R1C8 can only be <3> R9C2 can only be <6> R2C1 can only be <9> R1C9 can only be <4> R2C9 can only be <2> R2C2 can only be <1> R5C1 can only be <3> R5C4 can only be <8> R4C5 can only be <6>

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