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diff --git a/third_party/immer/example/set/intro.cpp b/third_party/immer/example/set/intro.cpp
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-//
-// immer: immutable data structures for C++
-// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
-//
-// This software is distributed under the Boost Software License, Version 1.0.
-// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
-//
-
-// include:intro/start
-#include <immer/set.hpp>
-int main()
-{
-    const auto v0 = immer::set<int>{};
-    const auto v1 = v0.insert(42);
-    assert(v0.count(42) == 0);
-    assert(v1.count(42) == 1);
-
-    const auto v2 = v1.erase(42);
-    assert(v1.count(42) == 1);
-    assert(v2.count(42) == 0);
-}
-// include:intro/end