Answer:
Sometimes black, sometimes white, I have veins but no blood
Though easy to spot, when allowed to plume, It is hard to see, when held in a room.
What letter comes next: O T T F F S S ?
I can be used to type and point you see. But don't forget, you can count on me. What am I?
There is someone, and there is always another, for without the other, there wouldn't be one
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?