Creating For Loop with 3 variables

I have 3 variables: a, b, c

I want to throw together a simple For loop with as few lines as possible. I know I can dim an array and fill it with these values and then iterate through the array, but that seems like overkill for what I want to do. Here is what works:

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This is what I want to do (but I'm getting a type mismatch error):

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Any idea if what I am trying to do is even possible?

I realize that from the previous posts you had written but I felt it would be an alright compromise for readability and I literally have only 3 variables to step through.

Thanks for the syntax