It predicts the next word
add a login 
screen41%
form23%
page19%
route17%
Pick the top one, or the next. Same prompt, different answer.

Same question, different answers

> add a login screen
Run 1
Builds a <LoginForm> component with local state.
Run 2
Adds a /login route with a server action.
The word for this is nondeterministic. One good run isn't proof, so you check every time.