Equal (4): Everything in this space must be equal to 4. The answer is 4-5, placed horizontally; 4-4, placed vertically.
Natural neighbour interpolation has a number of strengths over linear barycentric interpolation. Namely, it provides a smooth or continuous slope between samples3, and is always the same for a given point set, unlike the TIN where the quality of the triangulation can produce biases in the outcome, even in the best case.
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Number (6): Everything in this space must add up to 6. The answer is 1-3, placed vertically; 3-0, placed vertically.