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diff --git a/libcxx/modules/std/ratio.cppm b/libcxx/modules/std/ratio.cppm
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+// -*- C++ -*-
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+module;
+#include <ratio>
+
+export module std:ratio;
+export namespace std {
+  // [ratio.ratio], class template ratio
+  using std::ratio;
+
+  // [ratio.arithmetic], ratio arithmetic
+  using std::ratio_add;
+  using std::ratio_divide;
+  using std::ratio_multiply;
+  using std::ratio_subtract;
+
+  // [ratio.comparison], ratio comparison
+  using std::ratio_equal;
+  using std::ratio_greater;
+  using std::ratio_greater_equal;
+  using std::ratio_less;
+  using std::ratio_less_equal;
+  using std::ratio_not_equal;
+
+  using std::ratio_equal_v;
+  using std::ratio_greater_equal_v;
+  using std::ratio_greater_v;
+  using std::ratio_less_equal_v;
+  using std::ratio_less_v;
+  using std::ratio_not_equal_v;
+
+  // [ratio.si], convenience SI typedefs
+  using std::atto;
+  using std::centi;
+  using std::deca;
+  using std::deci;
+  using std::exa;
+  using std::femto;
+  using std::giga;
+  using std::hecto;
+  using std::kilo;
+  using std::mega;
+  using std::micro;
+  using std::milli;
+  using std::nano;
+  using std::peta;
+  using std::pico;
+  using std::tera;
+
+  // These are not supported by libc++, due to the range of intmax_t
+  // using std::yocto;
+  // using std::yotta;
+  // using std::zepto;
+  // using std::zetta
+} // namespace std