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This is the S3 generic method.
pk_subtract(pkproto_obj, pk_obj, objectname)
The `pk` object modified by the subtraction.
The `pkproto` object to be subtracted
The `pk` object to which the `pkproto` object is to be subtracted
The object name
[pk_subtract.pk_stat_model()] for the method for subtracting `pk_stat_model` objects (from `stat_model()`)