What is a doubled, doubled

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The Dvoudům is a larger building with two family houses. They are usually mirrored
inverted and have a communal garden. This is an economical solution when it is not necessary to ask for a building
permission to build two buildings, but only one. Couples can be one generation,
but more often it is a multiple generational residence where adult children live with one
own family and in the other parents or grandparents. In essence, it is more comfortable
version of the row building.