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diff --git a/contrib/llvm-project/libcxx/include/__random/knuth_b.h b/contrib/llvm-project/libcxx/include/__random/knuth_b.h
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+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP___RANDOM_KNUTH_B_H
+#define _LIBCPP___RANDOM_KNUTH_B_H
+
+#include <__config>
+#include <__random/linear_congruential_engine.h>
+#include <__random/shuffle_order_engine.h>
+
+#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
+# pragma GCC system_header
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+typedef shuffle_order_engine<minstd_rand0, 256> knuth_b;
+
+_LIBCPP_END_NAMESPACE_STD
+
+#endif // _LIBCPP___RANDOM_KNUTH_B_H