diff --git a/main.cpp b/main.cpp
index 3435b9e..4556896 100644
--- a/main.cpp
+++ b/main.cpp
@@ -6,6 +6,7 @@
 #include <cassert>
 #include <fstream>
 #include <string>
+#include <algorithm>
 
 #include "al_function.hpp"
 #include "al_bool_matrix.hpp"
@@ -314,6 +315,7 @@ void fill_ranks(vector<MyFunction> monomials) {
     vector< vector<MyFunction> > ranks;
     ranks.push_back(vector<MyFunction>()); // empty set
     ranks.push_back(monomials); // empty set
+    save_rank(1, monomials);
 
     cout << "rank index = " << 1 << endl;
     for (auto el: monomials) {