is there a way to extend LETTERS past 26 characters e.g., AA, AB, AC…?

Question

I use LETTERS most of the time for my factors but today I tried to go beyond 26 characters:

LETTERS[1:32]

Expecting there to be an automati

Answer 1

Yet another option:

l2 = c(LETTERS, sort(do.call("paste0", expand.grid(LETTERS, LETTERS[1:3]))))

Adjust the two instances of LETTERS inside expand.grid to get the number of letter pairs you'd like.