Welcome to the Wednesday Brain Game: What is the final letter in this sequence, and why?

EO, OE, O, EE, OU, IE, I, EE, EI, IE, ?

Here is the SOLUTION.

THE SOLUTION:

"E"

The sequence represents the numbers from zero to 10 without their consonants:

ZERO, ONE. TWO. THREE. FOUR. FIVE. SIX. SEVEN. EIGHT. NINE ... TEN.