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Question: How to count the numbers of parameters and variables in an expression

Question:How to count the numbers of parameters and variables in an expression

Annonymouse 160 Maple 2015
subexpression indets
July 09 2018
1

Here is an list of  expressions

[
k[a1]*C[T]*(R-x[1]-x[2])-k[d1]*x[1],
k[a2]*C[T]*(R-x[1]-x[2])-k[d2]*x[2]
]

I would like to have a counter that counts the number of parameters and variables. In my worksheets Variables always are x or y with a subscript, parameters are anything else.

I can't think of how to do this!
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