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Answer 1

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Zeolites occur naturally but are also produced industrially on a large scale. As of December 2018, 245 unique zeolite frameworks have been identified, and over 40 naturally occurring zeolite frameworks are known.[4][5] Every new zeolite structure that is obtained is examined by the International Zeolite Association Structure Commission and receives a three letter designation.[6]

Answer 2

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Recall that two circles are congruent if they have the same radii. Prove that equal chords of congruent circles subtend equal angles at their centres.