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 Sudoku Solution Path    R2C3 can only be <5> R9C9 can only be <8> R1C3 can only be <3> R9C7 can only be <7> R1C1 can only be <2> R9C3 can only be <4> R8C7 can only be <9> R1C8 can only be <9> R1C9 can only be <6> R1C7 can only be <5> R1C4 can only be <7> R2C7 is the only square in row 2 that can be <1> R3C9 is the only square in row 3 that can be <3> R3C8 is the only square in row 3 that can be <4> R5C1 is the only square in row 5 that can be <3> R9C1 can only be <5> R9C6 can only be <2> R9C2 can only be <3> R5C9 is the only square in row 5 that can be <4> R4C1 is the only square in row 4 that can be <4> R5C3 is the only square in row 5 that can be <1> R8C3 can only be <8> R8C5 can only be <5> R6C3 can only be <6> R7C3 can only be <9> R7C1 can only be <7> R8C6 can only be <7> R8C2 can only be <1> R7C2 can only be <2> R6C1 can only be <8> R7C5 is the only square in row 7 that can be <3> Squares R3C5 and R3C7 in row 3 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 row.    R3C4 - removing <28> from <2589> leaving <59>    R3C6 - removing <8> from <589> leaving <59> Squares R5C6 and R7C6 in column 6 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 column.    R4C6 - removing <68> from <5689> leaving <59> Squares R2C4<268>, R5C4<268> and R7C4<68> in column 4 form a comprehensive locked triplet. These 3 squares can only contain the 3 possibilities <268>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R6C4 - removing <2> from <259> leaving <59> Squares R7C4, R7C6, R5C4 and R5C6 form a Type-1 Unique Rectangle on <68>.    R5C4 - removing <68> from <268> leaving <2> R6C5 can only be <1> R6C9 can only be <9> R6C4 can only be <5> R4C9 can only be <1> R6C2 can only be <7> R3C4 can only be <9> R4C6 can only be <9> R3C6 can only be <5> R6C8 can only be <2> R4C2 can only be <5> R2C8 can only be <8> R2C4 can only be <6> R4C8 can only be <7> R3C7 can only be <2> R3C5 can only be <8> R2C5 can only be <2> R7C4 can only be <8> R4C5 can only be <6> R4C7 can only be <8> R5C6 can only be <8> R5C7 can only be <6> R7C6 can only be <6>