What is the order in catboost’s select_features mean?

I came across Catboost’s select_features function that uses RFE. Is the order of eliminated features represent the order in which features were removed? Or, is it random?

https://catboost.ai/en/docs/concepts/python-reference_catboost_select_features
https://catboost.ai/en/docs/concepts/output-data_features-selection

I am assuming the order is not random, but represents the order in which features were removed in a given iteration.

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