Choose the alphabet first
The alphabet is split into visible characters. Repeated characters are removed so each available letter has an equal chance. Exclusions remove characters before the draw. For whole words to start a writing exercise, draw from the word list.
A worked example
ABC with no repeats and an amount of 3 returns each of A, B and C once, in a random order.
Before you use the result
A joined character counts as one alphabet entry. Letter case follows your chosen case setting; this is not a language-frequency model.