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Most people would consider that an "edge case" which can be neglected in the model since it doesn't create any forces in the y direction.

An 8 edge case.

Dice have 12 edges.

So I went up to my friend and I was like "How many edges does a dice have?" and they said "eight."

"If it makes you feel any better, I thought the same thing. But we're both just idiots."

Not really, easy to make an error; for example, a cube has 12 edges, but a dice with rounded edges would have an infinite set of edges.

So it's a corner case?

Only if you are cornered.