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2. Key Stage 4 - Wikipedia

   en.wikipedia.org/wiki/Key_Stage_4

   Key Stage 4 (KS4) is the legal term for the two years of school education which incorporate GCSEs, and other examinations, in maintained schools in England normally known as Year 10 and Year 11, when pupils are aged between 14 and 16 by August 31. (In some schools, KS4 work is started in Year 9.)

3. Quaternion - Wikipedia

   en.wikipedia.org/wiki/Quaternion

   For two elements a 1 + b 1 i + c 1 j + d 1 k and a 2 + b 2 i + c 2 j + d 2 k, their product, called the Hamilton product (a 1 + b 1 i + c 1 j + d 1 k) (a 2 + b 2 i + c 2 j + d 2 k), is determined by the products of the basis elements and the distributive law. The distributive law makes it possible to expand the product so that it is a sum of ...