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Behold

4D word search

The way it works is, on a word search grid to be a straight line the coordinates must change in the following way

There are 4 axis

The coordinates of the next letter must be one more or less than the last ones, in at least one axis.

Example (1,1,1,1) (1,1,2,1) (1,1,3,1) is a valid straight line word position

So is (3,3,1,2) (2,3,2,2) (1,3,3,2)

However (1,2,3,1) (2,2,3,2) (2,2,3,3) is not