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The household of the average income group had about 127000 markkaa (approximately 21360 euros) for their expenses...

Suppose a “superdominant” Y chromosome arose that could not be feminized by X*.

Typically, this reduction is based on a polynomial number of non-deterministic steps. Hence the combination algorithm introduces its own NP-complexity, disregardless of the complexity of the algorithms that are available for the components.