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invert({Ks, Image}) ->
[{K, Image} || K <- Ks].
update_index(KIs, Index0) ->
lists:foldl(fun({K, I}, Acc) ->
dict:append(K, I, Acc)
Index0, KIs).
build_index(Docs) ->
Index = dict:new(),
lists:foldl(fun (Doc, Acc) -> update_index(invert(Doc), Acc) end,
Index, Docs).
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