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 Sudoku Solution Path    R4C4 can only be <7> R5C3 can only be <6> R8C2 can only be <4> R8C8 can only be <8> R8C1 can only be <2> R8C9 can only be <6> R1C9 is the only square in row 1 that can be <2> R2C2 is the only square in row 2 that can be <3> R1C6 is the only square in row 1 that can be <3> R3C1 is the only square in row 3 that can be <6> R5C4 is the only square in row 5 that can be <2> R9C7 is the only square in column 7 that can be <3> R9C9 is the only square in row 9 that can be <4> Squares R4C1 and R6C1 in column 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <49>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R1C1 - removing <49> from <45789> leaving <578>    R2C1 - removing <9> from <589> leaving <58>    R7C1 - removing <9> from <15789> leaving <1578>    R9C1 - removing <9> from <15789> leaving <1578> R2C8 is the only square in row 2 that can be <9> Squares R3C5 and R5C5 in column 5 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 column.    R6C5 - removing <5> from <3459> leaving <349>    R7C5 - removing <8> from <89> leaving <9> Squares R9C4 and R9C6 in row 9 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.    R9C1 - removing <8> from <1578> leaving <157>    R9C3 - removing <8> from <789> leaving <79> Intersection of row 9 with block 7. The values <79> only appears in one or more of squares R9C1, R9C2 and R9C3 of row 9. These squares are the ones that intersect with block 7. Thus, the other (non-intersecting) squares of block 7 cannot contain these values.    R7C1 - removing <7> from <1578> leaving <158>    R7C3 - removing <7> from <78> leaving <8> Squares R1C2 and R9C2 in column 2 and R1C8 and R9C8 in column 8 form a Simple X-Wing pattern on possibility <5>. All other instances of this possibility in rows 1 and 9 can be removed.    R1C1 - removing <5> from <578> leaving <78>    R9C1 - removing <5> from <157> leaving <17>    R1C4 - removing <5> from <58> leaving <8>    R1C7 - removing <5> from <1457> leaving <147> R1C1 can only be <7> R9C4 can only be <6> R3C5 can only be <5> R5C5 can only be <8> R5C6 can only be <1> R5C7 can only be <5> R4C6 can only be <9> R6C9 can only be <3> R6C5 can only be <4> R4C9 can only be <1> R9C6 can only be <8> R6C4 can only be <5> R9C1 can only be <1> R3C3 can only be <4> R3C7 can only be <7> R1C3 can only be <9> R3C9 can only be <8> R7C7 can only be <1> R2C9 can only be <5> R4C1 can only be <4> R6C6 can only be <6> R6C1 can only be <9> R4C5 can only be <3> R7C1 can only be <5> R1C7 can only be <4> R9C8 can only be <5> R9C2 can only be <9> R1C8 can only be <1> R7C9 can only be <7> R1C2 can only be <5> R9C3 can only be <7> R2C1 can only be <8>