Answer:
What letter comes next: O T T F F S S ?
What goes around the world and stays in a corner?
What relies on columns but isn't a house, and asks for help but can't speak itself?
This thing runs but cannot walk, sometimes sings but never talks. Lacks arms, has hands; lacks a head but has a face.
I can be used to type and point you see. But don't forget, you can count on me. What am I?
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.