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Acknowledgement Many individuals involved in the projects described here spent time patiently explaining their activities to me, putting together written descriptions for me to work from, and reviewing early drafts of my (often muddled) writeups of their research. Thanks are due all of them, but responsibility for mistakes and omissions is my own.doi:10.1145/775275.775278 fatcat:c5o7efmfwfczln4art3y5q2n4a