How do I choose which parameters to estimate in an ARMA model in python statsmodel?

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Say I have come to the conclusion that the model for a specific data set should be an ARMA model with parameters a1, a2, a3, a9, a10, a11 and c1, c2, c3, c9, c10, c11, c12.

How can I do a model fitting using only these parameters, and thus setting all other possible parameters to zero?

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