teacher / master / expert / model / army division / (old) troops / to dispatch troops
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Sherlock Holmes' teacher shows Sherlock one final trick in front of the space station before his training is complete. The teacher shows Sherlock how to electrify a kitchen knife using a defibrillator.
Sherlock Holmes (sh) started a supermarket (市) in the space station's bathroom (Ø4), but all he has for sale right now are berets (亠) and towels (巾). He should have opened it at the beach!