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• 0827258e - New why use git section and polish other slides.

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• 1b4cf78a - add changes requested by a colleague ;-)

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• 48ce8295 - removed Git definition.

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• d05412a5 - added notes.
• ac83eb73 - add another reference.

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• b8e95928 - add instructions for practice.

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mentioned in commit 869337ce