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 Sudoku Solution Path    R2C2 can only be <9> R5C5 can only be <7> R9C1 can only be <1> R8C2 can only be <5> R1C1 can only be <2> R3C3 can only be <8> R8C8 can only be <4> R7C3 can only be <9> R5C1 can only be <3> R6C3 can only be <2> R6C8 can only be <8> R6C2 can only be <4> R5C2 can only be <6> R4C2 can only be <8> R5C8 is the only square in row 5 that can be <2> R5C9 is the only square in row 5 that can be <4> R6C9 is the only square in row 6 that can be <3> Squares R1C6 and R1C9 in row 1 form a simple locked pair. These 2 squares both contain the 2 possibilities <59>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R1C5 - removing <59> from <3589> leaving <38> Squares R3C5 and R3C7 in row 3 form a simple locked pair. These 2 squares both contain the 2 possibilities <69>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R3C4 - removing <6> from <146> leaving <14>    R3C6 - removing <9> from <149> leaving <14> Squares R9C6 and R9C9 in row 9 form a simple locked pair. These 2 squares both contain the 2 possibilities <57>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R9C4 - removing <7> from <678> leaving <68>    R9C5 - removing <5> from <568> leaving <68> Squares R1C5<38>, R3C5<69>, R8C5<39> and R9C5<68> in column 5 form a comprehensive locked quad. These 4 squares can only contain the 4 possibilities <3689>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the column.    R2C5 - removing <6> from <256> leaving <25> Squares R1C6 and R1C9 in row 1 and R9C6 and R9C9 in row 9 form a Simple X-Wing pattern on possibility <5>. All other instances of this possibility in columns 6 and 9 can be removed.    R2C6 - removing <5> from <257> leaving <27>    R4C9 - removing <5> from <579> leaving <79>    R7C6 - removing <5> from <2457> leaving <247> Squares R4C1 and R4C9 in row 4 form a simple locked pair. These 2 squares both contain the 2 possibilities <79>. Since each of the squares must contain one of the possibilities, they can be eliminated from the other squares in the row.    R4C7 - removing <79> from <15679> leaving <156> Squares R5C3, R5C7, R4C3 and R4C7 form a Type-1 Unique Rectangle on <15>.    R4C7 - removing <15> from <156> leaving <6> R4C8 can only be <5> R3C7 can only be <9> R4C3 can only be <1> R2C8 can only be <6> R5C7 can only be <1> R5C3 can only be <5> R2C4 can only be <7> R3C5 can only be <6> R6C7 can only be <7> R1C9 can only be <5> R6C1 can only be <9> R7C7 can only be <5> R4C9 can only be <9> R7C5 can only be <2> R9C9 can only be <7> R9C6 can only be <5> R1C6 can only be <9> R2C6 can only be <2> R7C4 can only be <4> R2C5 can only be <5> R9C5 can only be <8> R4C1 can only be <7> R7C6 can only be <7> R3C4 can only be <1> R9C4 can only be <6> R1C5 can only be <3> R1C4 can only be <8> R8C5 can only be <9> R8C6 can only be <1> R3C6 can only be <4> R8C4 can only be <3>