Equidistant Sequences

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825 Combined Equidistant Sequence Solutions. By Dan Thomasson.

The above image shows all 825 possible Equidistant Sequences of three items (whether numbers, letters, or pictures) that can be equally spaced apart on the same line in the 10 x 10 square grid.  I used this solution key to develop my seven-volume puzzle-book series called Search for E. S. (Equi​distant Sequences).

If you look closely at the center of the image above, you can see a Templar Cross or Maltese Cross as shown below.
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Templar Cross or Maltese Cross inside Equidistant Sequence Solution Key.