How is "subitize" pronounced?

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BobG said:
82. To count 246 toothpicks, he had to look at them in three groups. That was a movie. I don't think that could happen in real life.
Oh thanks. Huh. Funny thing, the memory. I couldn't remember the exact number, but I would have sworn that:
a] there were three toothpicks in the box
b] the 3 groups were 3 of a prime number (which 82 is not)

I think the feats in the movie are based on real feats.