Malte Monkey (mu) is setting up a Christmas tree (木) in the bathroom of the space station (Ø4). He decorates the tree with eight-balls (八) and puts a holy cross (十) at the top of the tree.
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Just inside the ashram's kitchen, the detective is investigating a passed out Charlie Chaplin who's lying under a Christmas tree. Could it have something to do with the big empty mug which was formerly filled with glühwein?