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data Doc = Doc { tag :: Node, order :: [Id], childs :: Map Id Doc }
doc__get_child :: Doc -> Id -> Doc
doc__get_child doc id = fromJust (Data.Map.lookup id (childs doc))
doc__set_child :: Doc -> Id -> Doc -> Doc
doc__set_child doc id value = doc { childs = Data.Map.insert id value (childs doc) }
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