Not at all sure on the logic front, Tes.
Usually 26 letters minus the 'l' because it's Xmas and we currently have noel as Barrie pointed out.
So now 25 letters, one of which is 'u' and one of which is 'uu'.
Surely that takes us back to 26 letters if repeats are allowed?
Or not.
I trust you all had a great Xmas day no matter what Christmas Crackers you had to endure.
Colin ???