Problem with diff_burnable_mats=True

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I believe i got around the problem by including the following lines in my Python script before running the depletion simulation:

geometry.determine_paths(instances_only = False) 

model = openmc.model.Model(...)

model.differentiate_depletable_mats(diff_volume_method = 'divide equally')

This seems to differentiate the burnable materials in the model before we include that option in the openmc.deplete.CoupledOperator, but i am not sure.

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