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diff --git a/cryptominisat5/cryptominisat-5.6.3/src/main_common.h b/cryptominisat5/cryptominisat-5.6.3/src/main_common.h
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+/*************************************************************
+MiniSat       --- Copyright (c) 2003-2006, Niklas Een, Niklas Sorensson
+CryptoMiniSat --- Copyright (c) 2014, Mate Soos
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+***************************************************************/
+
+#ifndef __MAIN_COMMON_H__
+#define __MAIN_COMMON_H__
+
+#include "cryptominisat5/cryptominisat.h"
+#include <iostream>
+#include <cmath>
+
+//Returns the number of undefined variables
+uint32_t print_model(std::ostream* os, CMSat::SATSolver* solver)
+{
+    *os << "v ";
+    size_t line_size = 2;
+    size_t num_undef = 0;
+    for (uint32_t var = 0; var < solver->nVars(); var++) {
+        if (solver->get_model()[var] != CMSat::l_Undef) {
+            const bool value_is_positive = (solver->get_model()[var] == CMSat::l_True);
+            const size_t this_var_size = std::ceil(std::log10(var+1)) + 1 + !value_is_positive;
+            line_size += this_var_size;
+            if (line_size > 80) {
+                *os << std::endl << "v ";
+                line_size = 2 + this_var_size;
+            }
+            *os << (value_is_positive? "" : "-") << var+1 << " ";
+        } else {
+            num_undef++;
+        }
+    }
+    *os << "0" << std::endl;
+    return num_undef;
+}
+
+#endif //__MAIN_COMMON_H__