t, f and s.... these are the initial letters of the days of the week.
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Mississippi
IJLOS abcdefghijklmnopqrstuvwxyz IJ - skip 0 letters JL - skip 1 letter LO - skip 2 letters OS - skip 3 letters S? - skip 4 letters The next letter is X.
N as gap between letters is 3 [FGH] then 2 [JK] so next is 1 [M] making N next
They all have 3 letters, but "red" and "tan" have exactly 3 letters.
The next logical letter in this progression would be 'e.' The pattern is taking every 3rd letter in reverse alphabetical order. So 3 letters before h would be e.