How do I send one step with an single switch to an digit?

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btm
 
Feb 14, 2010 (19:46)
The Digit should be switched to 3 different values (CC X Values 0-2)
And I don´t know how I should make that. I tried some Formulars but I don´t really understand how I should send a simple step forward.
I would be happy for some help.
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