Normal 6x6 Sudoku rules apply.
[IDX] Index lines: On a blue line, the digit in the Nth position (starting from the diamond) indicates the position along the line where the digit N appears.
[REN] Renban lines: Pink lines are filled with a set of unique, consecutive digits.
[SLO] Slow thermos: Digits along the white slow thermo increase or stay the same from the bulb to the tip.
Solution code: Row 2, left to right
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