department of physics · 2020. 5. 20. · 2019 ww-digi i have received "roger" from x, so...

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Page 1: Department of Physics · 2020. 5. 20. · 2019 WW-Digi I have received "roger" from X, so I know X has copied my exchange. I have sent "roger" to X. Note, however, that no fixed set