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 Sudoku Solution Path    R5C5 can only be <1> R5C8 can only be <2> R5C9 can only be <6> R2C5 can only be <6> R5C1 can only be <4> R5C2 can only be <9> R4C7 is the only square in row 4 that can be <4> R6C1 is the only square in row 6 that can be <6> R8C5 is the only square in row 8 that can be <2> R1C5 can only be <9> R9C5 can only be <5> R3C9 is the only square in row 3 that can be <9> R7C6 is the only square in row 7 that can be <9> R9C4 is the only square in row 9 that can be <4> R7C4 can only be <3> R9C6 can only be <7> R7C2 is the only square in row 7 that can be <4> Intersection of column 2 with block 1. The value <8> only appears in one or more of squares R1C2, R2C2 and R3C2 of column 2. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.    R1C3 - removing <8> from <12578> leaving <1257>    R2C3 - removing <8> from <178> leaving <17> Intersection of column 8 with block 3. The value <8> only appears in one or more of squares R1C8, R2C8 and R3C8 of column 8. These squares are the ones that intersect with block 3. Thus, the other (non-intersecting) squares of block 3 cannot contain this value.    R1C7 - removing <8> from <1358> leaving <135>    R1C9 - removing <8> from <13578> leaving <1357>    R2C7 - removing <8> from <138> leaving <13> R1C6 is the only square in row 1 that can be <8> R3C6 can only be <3> Squares R3C2 and R3C8 in row 3 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 row.    R3C1 - removing <5> from <125> leaving <12> Squares R2C2 and R8C2 in column 2 and R2C8 and R8C8 in column 8 form a Simple X-Wing pattern on possibility <3>. All other instances of this possibility in rows 2 and 8 can be removed.    R2C7 - removing <3> from <13> leaving <1>    R8C7 - removing <3> from <359> leaving <59> R2C3 can only be <7> R1C9 is the only square in row 1 that can be <7> R8C8 is the only square in row 8 that can be <7> R7C8 can only be <5> R7C9 can only be <1> R3C8 can only be <8> R8C7 can only be <9> R7C1 can only be <7> R8C3 can only be <5> R3C2 can only be <5> R2C8 can only be <3> R8C2 can only be <3> R6C3 can only be <8> R2C2 can only be <8> R1C7 can only be <5> R4C3 can only be <2> R9C1 can only be <1> R9C3 can only be <9> R3C1 can only be <2> R6C7 can only be <3> R3C4 can only be <1> R1C1 can only be <3> R4C1 can only be <5> R1C3 can only be <1> R1C4 can only be <2> R4C9 can only be <8> R9C9 can only be <3> R6C9 can only be <5> R9C7 can only be <8>