How many vowels do you actually want?
What the dice deal you, what it pays, and why the answer is not simply "more".
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Everyone has a vowel theory. Most of them are wrong.
Knowing the supply is one thing; knowing what to want from it is another. Everyone has a theory about vowels, and most of them are wrong. Here is that same million deals cut by how many vowels the tray shows. Vowels are counted per letter, not per cube — a two-letter face contributes both of its letters, so Qu is one vowel and one consonant, An/Er/He/In are one vowel each, and Th is none. That is why Classic Boggle deals 16.17 letters on 16 cubes: the count is of letters you can play, not of dice.