>>Problem 2: What is the next letter in this series: OTTFFSSEN?
>
>T
For the third problem, the sequence "SUN" - which only happens to be a queer coincidence - might give you a hint.
Hilmar.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)