The next letter is T - They're the initial letters of the numbers 1-10
One Two Three Four Five Six Seven Eight The next letter is N! (Nine)
R
The letter N. It represents 1 2 3 4 5 6 7 8....9.
T (letters without curves)
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -E-E-F-N. That is, eight letter words with 2nd letter E and 4th letter E and 6th letter F and 8th letter N. In alphabetical order, they are: bedeafen
The next letter should be N, following the sequence E I L N.
N (First, Second, Third, Fourth, Fifth, Sixth, Seventh, Eighth, Ninth)
k... for king think deck of cards
n = nine The letters are the first letter of each number when you count. O = One, T = Two, T = Three, F = Four, etc.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern -E-FF-N--. That is, nine letter words with 2nd letter E and 4th letter F and 5th letter F and 7th letter N. In alphabetical order, they are: reoffends
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern N-FF-E--. That is, eight letter words with 1st letter N and 3rd letter F and 4th letter F and 6th letter E. In alphabetical order, they are: naffness niffiest
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 2 words with the pattern F-E-N. That is, five letter words with 1st letter F and 3rd letter E and 5th letter N. In alphabetical order, they are: foehn freon