Most people will suggest having the end of the word in a separate text box. This CAN work but it is not easy to make the alignment correct and is difficult if you need to later edit the word.
A way that can work better is to type in the WHOLE word. Set the letter you do not want to show to be the same colour as the background and then use a brush on color animation to change the whole word to the original color.
This will only work if you have a plain background
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