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-module(a).
-export([vi/1, sum/2, vc/1]).
-spec vi(b:integer()) -> 'ok'.
vi(I) when is_integer(I) ->
ok.
-spec sum(b:integer(), integer()) -> integer().
sum([A], B) ->
A + B.
-spec vc(b:collection()) -> 'ok'.
vc({Int, List}) when length(List) =:= Int ->
ok.
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