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Letter sequences

Letters represent words that are somehow connected in a sequence. Find the next letter.

For example if the clue is:

M T W T __

Solution: Friday (F). The letters follow the sequence: Monday (M), Tuesday (T), Wednesday (W), Thursday (T), Friday (F)

1. T T T F F S S ?

Eighty (E). Ten, Twenty, Thirty, Forty, Fifty, Sixty, Seventy, Eighty

2. F S T F F S ?

Seventh (S). First, Second, Third ...

3. O T T F F S S E ?

Nine (N). One, Two, Three ...

4. J F M A M J J ?

August (A). June, July, August.

5. A T G C L V L S S ?

Capricorn (C). Scorpio, Sagittarius, Capricorn.