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Are you talking about inputing, for example, p1_x sometimes and not inputing it at others? If so, my advice would be to still input it for simplicity, but immediately after the serin change its value to whatever you want it to be. Likewise, you can always alias a more convient name to use the same space as p1_x. For example:
newVarName VAR p1_x
just remember that anything you write to newVarName will also change the contents of p1_x, and vice-versa.
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