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Q: Hindu philosophy also includes several sub-schools of theistic philosophies that integrate ideas from two or more of the six orthodox philosophies, such as the realism of the Nyaya, the naturalism of the Vaisesika, the dualism of the Sankhya, the monism and knowledge of Self as essential to liberation of Advaita, the self-discipline of yoga and the asceticism and elements of theistic ideas. Examples of such schools include Pasupata Saiva, Saiva siddhanta, Pratyabhijna, Rasesvara and Vaisnava. Some sub-schools share Tantric ideas with those found in some Buddhist traditions. The ideas of these sub-schools are found in the Puranas and Agamas.
A:
How many orthodox philosophies are in Hindu?