Das Haus vom Nikolaus (Graph theory)

Hey there,
do you know that little children's game where you have to draw a house without lifting the pencil and using one line only once?
Well, this scenario will show you all the ways to draw that house (in total: 88).

P.S.: I don't know an English name for the drawing game but in German it's called "Das Haus vom Nikolaus". Hence the name.

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