Does anyone know how to 'undo' a accidental entry in my phones T9 dictionary?

Thanks to a call that interrupted a text i was writing when i enter ‘it’ it comes up as ‘48’ first.

Ive tried entering ‘it’ as a new word and ive tried repeatedly switching from ‘48 to ‘it’ in a text.

Neither method has fixed the problem.

Since the word ‘it’ is used frequently in converstion this drives me extra nuts.

I have a Samsung A717.