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Welcome to the CK12.ORG website (the "Site") which is owned and operated by CK-12 Foundation, a California non-profit corporation ("CK-12" or "we"). CK-12's mission is to reduce the cost of textbook materials for the K-12 market both in the U.S. and worldwide. Using an open-source, collaborative, and web-based compilation model, CK-12 pioneers and promotes the creation and distribution of high-quality, adaptive online textbooks that can be mixed, modified and printed (i.e., the FlexBook™ textbooks).