upsc civil service ias exam 2014-What is the combination of Optional subjects which is not allowed? or allowed?

What is the combination of Optional subjects which is not allowed? Combinations not allowed are:

• Any two literature subjects

• Political Science & International Relations + Public Administration

• Commerce & Accountancy + Management

• Anthropology + Sociology

• Mathematics + Statistics

• Agriculture + Animal Husbandry & Veterinary Science

• Management + Public Administration

• Any two engineering subjects

• Medical Science + Animal Husbandry & Veterinary Science

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