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 Sudoku Solution Path    R3C6 is the only square in row 3 that can be <3> R7C6 can only be <6> R7C8 can only be <4> R9C8 can only be <2> R9C6 can only be <7> R7C7 is the only square in row 7 that can be <3> R8C5 is the only square in row 8 that can be <2> R9C5 is the only square in row 9 that can be <3> R9C1 is the only square in row 9 that can be <4> R9C2 is the only square in row 9 that can be <5> Squares R3C4 and R3C8 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <67>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R3C2 - removing <6> from <269> leaving <29>    R3C7 - removing <67> from <4679> leaving <49> Squares R7C4 and R9C4 in column 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <89>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R1C4 - removing <8> from <5678> leaving <567> Intersection of row 2 with block 1. The value <5> only appears in one or more of squares R2C1, R2C2 and R2C3 of row 2. These squares are the ones that intersect with block 1. Thus, the other (non-intersecting) squares of block 1 cannot contain this value.    R1C1 - removing <5> from <1569> leaving <169> Intersection of column 7 with block 6. The value <7> only appears in one or more of squares R4C7, R5C7 and R6C7 of column 7. These squares are the ones that intersect with block 6. Thus, the other (non-intersecting) squares of block 6 cannot contain this value.    R5C8 - removing <7> from <167> leaving <16> Squares R2C1, R2C7 and R2C9 in row 2, R4C1, R4C7 and R4C9 in row 4 and R8C7 and R8C9 in row 8 form a Swordfish pattern on possibility <6>. All other instances of this possibility in columns 1, 7 and 9 can be removed.    R1C1 - removing <6> from <169> leaving <19>    R1C9 - removing <6> from <14689> leaving <1489>    R5C1 - removing <6> from <167> leaving <17>    R5C9 - removing <6> from <1246> leaving <124> Squares R1C1<19>, R5C1<17> and R8C1<79> in column 1 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <179>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R2C1 - removing <1> from <156> leaving <56>    R4C1 - removing <17> from <13567> leaving <356>    R6C1 - removing <17> from <1357> leaving <35> Squares R1C1 and R5C1 in column 1 and R1C8 and R5C8 in column 8 form a Simple X-Wing pattern on possibility <1>. All other instances of this possibility in rows 1 and 5 can be removed.    R1C2 - removing <1> from <169> leaving <69>    R5C2 - removing <1> from <126> leaving <26>    R1C9 - removing <1> from <1489> leaving <489>    R5C9 - removing <1> from <124> leaving <24> R7C2 is the only square in column 2 that can be <1> R7C3 can only be <8> R7C4 can only be <9> R8C3 can only be <7> R9C4 can only be <8> R8C1 can only be <9> R9C9 can only be <9> R1C1 can only be <1> R5C1 can only be <7> R5C5 can only be <4> R5C9 can only be <2> R2C5 can only be <8> R5C2 can only be <6> R1C5 can only be <7> R5C8 can only be <1> R1C2 can only be <9> R3C2 can only be <2> R1C8 can only be <6> R3C4 can only be <6> R1C4 can only be <5> R3C8 can only be <7> R2C7 can only be <4> R2C3 can only be <5> R2C9 can only be <1> R3C7 can only be <9> R6C7 can only be <7> R1C9 can only be <8> R3C3 can only be <4> R4C7 can only be <6> R1C6 can only be <4> R6C4 can only be <1> R8C9 can only be <6> R2C1 can only be <6> R4C9 can only be <3> R8C7 can only be <8> R4C1 can only be <5> R6C9 can only be <4> R6C3 can only be <2> R4C4 can only be <7> R4C6 can only be <2> R6C1 can only be <3> R4C3 can only be <1> R6C6 can only be <5>