T (letters without curves)
the next letter would be 'b'
M, standing for May, of course, dummy!
The next letter is D. The pattern is every fourth letter. Ie. a b c D e f g H i j k L m n o P and so on...
J for Junebecause it goes January, February, March, April, May June!
R All other brackets all have 3 steps between a letter to the next.
For the letter m, mob, mass, movement; for the letter f, family
It looks as if every third letter is an "r"; the remaining letters are in sequence.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern I-F-M-M. That is, seven letter words with 1st letter I and 3rd letter F and 5th letter M and 7th letter M. In alphabetical order, they are: infimum