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No tongue , eyebrow or other body piercing are acceptable within the clinical setting . The tertiary carbon structure of diamonds is responsible for the extreme hardness of this mineral , which has a name derived from the Greek work adamas , meaning unconquerable . Adding Classes : After registration materials have been filed with the Registrar , a student may add a course or change a section up to the close of the late registration period . With the tight linkage between space and information , any future battle for space superiority will really be a battle for information superiority . And if that decision was made and granted , that would be a decision made by the political leaders of the country , then it had to be a decision that was based upon the strategic necessities of the situation , something that was vital to the country to do , not just for the present but for the future .