Assertion: keyboard | /r/CreatedBy | man-kind
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Source sentences:
text: Some other types of keyboard instruments include celestas, which are struck idiophones operated by a keyboard, carillons, which are highly different instruments made by man-kind that are usually housed in bell towers or belfries of churches or other municipal buildings, and other non-acoustic instruments, such as various electronic organs, synthesizers, and keyboards designed to imitate the sound of other musical sounds.