on account of - because of, a breakthrough - an important discovery that provides an answer to a problem, as a mark of respect - something that shows a person is displaying admiration, an exercise in - a practice or action intended to improve something or make something happen, try their hand at - to do an activity for the first time in order to find out if you like it or are good at it, drawing on - using information or knowledge of something to help you do something, a prototype - the first example form of something new, made before it is produced in large quantities, sparked - caused the start of something, shake up (informal) - to create large changes in something such as an organisation, usually in order to make improvements,

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