What are this "equations" on door's frames in Germany? [duplicate]
![What are this "equations" on door's frames in Germany? [duplicate] - White Wooden Picture Frame on Glass Table](/assets/images/what_are_this_quotequationsquot_on_door39s_frames_in_germany_duplicate_0.jpeg "What are this \"equations\" on door's frames in Germany? [duplicate] - White Wooden Picture Frame on Glass Table")
While doing a round trip with my girl and friends, we have found a peculiar encryption on the frames of some doors in South Germany
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![What are this "equations" on door's frames in Germany? [duplicate] - Man Holding White Linen Ad White Towel](/assets/images/what_are_this_quotequationsquot_on_door39s_frames_in_germany_duplicate_1.jpeg "What are this \"equations\" on door's frames in Germany? [duplicate] - Man Holding White Linen Ad White Towel")
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Monty Hall Problem - Numberphile
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