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Monday Mutant 51: Straight and Arrow (indirect)

In this Straight and Arrow puzzle, a number followed by a question mark represents how many black cells are in at least one of the four orthogonal directions (that is, the question mark can be replaced by an up arrow, a down arrow, a left arrow, or a right arrow, and be a normal Straight and Arrow clue). A number followed by an x means that none of the four orthogonal directions contain that many black cells. (Note that for the purposes of a 0? or a 0x on an edge or in a corner, any orthogonal direction which would point off of the grid is excluded.) A number followed by a plus sign represents the total number of black cells in all four orthogonal directions. The rules are otherwise unchanged.

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