I'm learning to touch-type using TypingMaster Pro.

Is there a touch-typing software that lets you do exercises on a limited number of letters? They all go too fast for me. I want to first master a and s, achieve a high WPM, and only then add more letters progressively, while maintaining my speed. So I want typing exercises with a and s only, like:

aasa as a ssa s s s as as asasaaaa s as s  as asas s saasssas asssa

I could not find such an option in TypingMaster Pro nor in Ainsworth.

Does anyone know of a program that offers this?

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