Divide the grid into nine regions of nine orthogonally connected cells, and fill every cell with a digit from 1-9 so there are no repeats in a row, column, or region. Every 5 in the grid must have a '1' directly above it or a '9' directly below it. It may have both, but it doesn't need both. Along a (slow) thermometer, digits must not decrease moving along a line away from the bulb. Additionally, two cells connected orthogonally by a thermometer must be in the same region. Diagonal connections have no additional restriction.
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