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* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2018 Clifford Wolf <clifford@clifford.at>
+ * Copyright (C) 2018 David Shah <david@symbioticeda.com>
+ *
+ * Simulated annealing implementation based on arachne-pnr
+ * Copyright (C) 2015-2018 Cotton Seed
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above