Must be an O somewhere…
Unfortunately there are no N’s in this sentence.
Strike five.
Here’s the sentence:
SCHOOL HOURS FLOW SLOWLY.
Short sentences can evade the rules of statistics.
I will put forth a long one for the next round:
_ _ _ / _ _ _ _ _ _ _ / _ _ _ _ _ _ / _ _ _ _ _ _ _ / _ _ _ / _ _ _ _ _ _ / _ _ _ _ _ _ _ _ / _ _ _ / _ _ _ _ _ / _ _ _ _ _ _ _ _ .
Good guess, but the fifth strike caused the round to end right before it.
Maybe we can use it for the next round. ![]()
E (ieio)
(e) I (eio)
Thank you for your guesses. 
Both E and I can be found in the sentence:
_ _ E / _ _ _ _ _ E _ / _ _ _ _ E _ / _ _ _ _ I E _ / _ _ _ / _ I _ _ _ E / _ _ _ _ I E _ _ / _ _ _ / _ _ E I _ / _ _ _ I _ I E _ .
Howza 'bout a little old “D”, eh?
Only four of them. 
_ _ E / _ _ _ _ _ E _ / _ _ _ _ E _ / _ _ _ _ I E D / _ _ D / _ I _ _ _ E / _ _ _ D I E _ _ / _ _ D / _ _ E I _ / _ _ _ I _ I E _ .
Then maybe an “R”?
Four of them again. 
_ _ E / _ _ _ _ _ E _ / _ _ _ _ E _ / _ _ R R I E D / _ _ D / _ I _ _ _ E / _ _ _ D I E R _ / _ _ D / _ _ E I R / _ _ _ I _ I E _ .
And a spot of “T” before bedtime?
Yes, there are a couple of T’s.
T _ E / _ _ _ _ _ E _ / _ _ _ _ E _ / _ _ R R I E D / _ _ D / _ I _ _ _ E / _ _ _ D I E R _ / _ _ D / T _ E I R / _ _ _ I _ I E _ .
And ‘S’…
Yes, there are several S’s here. 
T _ E / _ _ _ _ _ E _ / _ _ _ S E S / _ _ R R I E D / _ _ D / S I _ _ _ E / S _ _ D I E R S / _ _ D / T _ E I R / _ _ _ I _ I E S .
H, please.
Yes, there are H’s in this sentence.
T H E / _ _ _ _ _ E _ / H _ _ S E S / _ _ R R I E D / _ _ D / S I _ _ _ E / S _ _ D I E R S / _ _ D / T H E I R / _ _ _ I _ I E S .
Ought to be a pair of Ls there…
Give us an “O”.
A please.