diff --git a/bin/main.cpp b/bin/main.cpp
index 2736396..7ac9f66 100644
--- a/bin/main.cpp
+++ b/bin/main.cpp
@@ -1,6 +1,7 @@
 #include <iostream>
 
 #include <map>
+#include <set>
 #include <vector>
 
 #include "string/string.hpp"
@@ -10,27 +11,27 @@
 
 int main(int argc, char *argv[])
 {
-  // {// ex: split_str
-  //   std::string str { "asdf,qwer,zxcv" };
-  //   hack::string::v_str v = hack::string::split_str(str, ',');
-  //   for (const auto& c : v) std::cout << c << std::endl;
-  // }
-  //
-  // {// ex: within
-  //   std::cout << std::boolalpha << hack::range::within(12, 34, 12, 23, 31, 17, 22, 33) << std::endl;
-  // }
-  // 
-  // {// ex: v_multiset
-  //   std::vector<std::string> v;
-  //   hack::container::v_multiset(v, "asdf", "qwer", "zcv");
-  //   for(const auto& c : v) std::cout << c << std::endl;
-  // }
-  //
-  // {// ex: s_multiset
-  //   std::set<int> s;
-  //   hack::container::s_multiset(s, 1, 2, 3, 3, 2, 1);
-  //   for(const auto& c : s) std::cout << c << std::endl;
-  // }
+  {// ex: split_str
+    std::string str { "asdf,qwer,zxcv" };
+    hack::string::v_str v = hack::string::split_str(str, ',');
+    for (const auto& c : v) std::cout << c << std::endl;
+  }
+
+  {// ex: within
+    std::cout << std::boolalpha << hack::range::within(12, 34, 12, 23, 31, 17, 22, 33) << std::endl;
+  }
+
+  {// ex: vector_multiset
+    std::vector<std::string> v;
+    hack::container::vector_multiset(v, "asdf", "qwer", "zcv");
+    for(const auto& c : v) std::cout << c << std::endl;
+  }
+
+  {// ex: set_multiset
+    std::set<int> s;
+    hack::container::set_multiset(s, 1, 2, 3, 3, 2, 1);
+    for(const auto& c : s) std::cout << c << std::endl;
+  }
 
   {// ex: log
     hack::log()(1234, "run in main", 1234);
@@ -52,4 +53,15 @@ int main(int argc, char *argv[])
     std::tuple<int, std::string, bool> tp { 1, "tuple test", false };
     hack::log()(tp);
   }
+
+  {// ex: matches
+    std::vector<int> v { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+    hack::log()(hack::container::matches(v, 2, 5, 4, 12));
+  }
+  
+  {// ex: vector_remove_at
+    std::vector<int> v { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+    hack::container::vector_remove_at(v, 3);
+    hack::log()(v);
+  }
 }
diff --git a/bin/meson.build b/bin/meson.build
index 312c7e2..0c9c1f4 100644
--- a/bin/meson.build
+++ b/bin/meson.build
@@ -1,4 +1,5 @@
 deps += view_dep
+deps += concepts_dep
 deps += iterators_dep
 deps += string_dep
 deps += range_dep
diff --git a/src/concepts/concepts.hpp b/src/concepts/concepts.hpp
new file mode 100644
index 0000000..d8e99b4
--- /dev/null
+++ b/src/concepts/concepts.hpp
@@ -0,0 +1,27 @@
+#pragma once
+
+#include <iostream>
+#include <vector>
+#include <list>
+#include <map>
+#include <unordered_map>
+
+namespace hack::concepts
+{
+  template<typename T>
+  concept is_sequence_container = std::same_as<T, std::vector<typename T::value_type>> || 
+    std::same_as<T, std::list<typename T::value_type>>;
+
+  template<typename T>
+  concept is_tuple = requires (T t)
+  { 
+    std::tuple_cat(t, std::make_tuple(1, "tuple"));
+  };
+
+  template<class T>
+  concept is_string = std::is_convertible_v<T, std::string_view>;
+
+  template<class T>
+  concept is_map = std::same_as<T, std::map<typename T::key_type, typename T::mapped_type, typename T::key_compare, typename T::allocator_type>> ||
+    std::same_as<T, std::unordered_map<typename T::key_type, typename T::mapped_type, typename T::hasher, typename T::key_equal, typename T::allocator_type>>;
+}
diff --git a/src/concepts/meson.build b/src/concepts/meson.build
new file mode 100644
index 0000000..acfdb02
--- /dev/null
+++ b/src/concepts/meson.build
@@ -0,0 +1,14 @@
+headers = ['concepts.hpp']
+sources = []
+
+lib = library(
+  'concepts',
+  include_directories : inc,
+  install : true,
+  sources: [headers, sources]
+)
+
+concepts_dep = declare_dependency(
+  include_directories: inc,
+  link_with: lib
+)
diff --git a/src/container/container.hpp b/src/container/container.hpp
index fbb47b6..4f03b51 100644
--- a/src/container/container.hpp
+++ b/src/container/container.hpp
@@ -1,7 +1,6 @@
 #pragma once
 
-#include <vector>
-#include <set>
+#include <algorithm>
 
 namespace hack::container
 {
@@ -18,4 +17,33 @@ namespace hack::container
   {
     (r.insert(args), ...);
   }
+
+  template<typename Range, typename... Args>
+  int matches(Range r, Args... args)
+  {
+    return (std::count(std::cbegin(r), std::cend(r), args) + ...);
+  }
+
+  // -----------------------------------------------------
+  // remove vector element if vector sorting no important
+  template<typename T>
+  void vector_remove_at(std::vector<T>& v, std::size_t idx)
+  {
+    if (idx < v.size())
+    {
+      v[idx] = std::move(v.back());
+      v.pop_back();
+    }
+  }
+  
+  template<typename T>
+  void vector_remove_at(std::vector<T>& v, typename std::vector<T>::iterator it)
+  {
+    if (it != v.end())
+    {
+      *it = std::move(v.back());
+      v.pop_back();
+    }
+  }
+  // -----------------------------------------------------
 }
diff --git a/src/logger/logger.hpp b/src/logger/logger.hpp
index 4aa52fb..d6755f2 100644
--- a/src/logger/logger.hpp
+++ b/src/logger/logger.hpp
@@ -1,13 +1,9 @@
 #pragma once
 
-#include <iostream>
 #include <experimental/source_location>
-#include <vector>
-#include <list>
-#include <map>
-#include <unordered_map>
 
 #include "view/color.hpp"
+#include "concepts/concepts.hpp"
 #include "iterators/sequence_ostream_iterator.hpp"
 #include "iterators/associative_ostream_iterator.hpp"
 
@@ -113,6 +109,14 @@ namespace hack
         std::cout << " }" << (count != 0 ? devider : "");
       }
 
+      template <template <class, class> typename Function, class ...Args>
+      auto LogCall(std::string fun_name, Function<Args...> fun, std::string fun_param = "", Args... args) 
+      {
+        auto temp{ fun(args...) };
+        std::cout << fun_name << "of" << fun_param << "/t -> /t" << temp << '\n';
+        return temp;
+      }
+
       friend class warn;
       friend class error;
   };
diff --git a/src/meson.build b/src/meson.build
index 8a3b66e..5781e98 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -1,6 +1,7 @@
 inc += include_directories('.')
 
 subdir('view')
+subdir('concepts')
 subdir('iterators')
 subdir('string')
 subdir('range')
diff --git a/src/range/range.hpp b/src/range/range.hpp
index a91f5fd..662a2b1 100644
--- a/src/range/range.hpp
+++ b/src/range/range.hpp
@@ -5,8 +5,8 @@ namespace hack::range
   template<typename T, typename... Args>
   bool within(const T min, const T max, Args... args)
   {
-    return ((min <= args && max >= args) && ...);
     // 1, 5, 2, 3, 4
     // ( (1 <= 2 && 5 >= 2) && (1 <= 3 && 5 >= 3) && (1 <= 4 && 5 >= 4) )
+    return ((min <= args && max >= args) && ...);
   }
 }
diff --git a/src/string/string.cpp b/src/string/string.cpp
index 37f9aa6..70914d4 100644
--- a/src/string/string.cpp
+++ b/src/string/string.cpp
@@ -1,7 +1,5 @@
 #include "string.hpp"
 
-#include <iostream>
-
 namespace hack::string
 {
   v_str split_str(const std::string& str, char t)
diff --git a/tests/container.cpp b/tests/container.cpp
index 612aff3..1662b66 100644
--- a/tests/container.cpp
+++ b/tests/container.cpp
@@ -2,9 +2,15 @@
 
 #include "container/container.hpp"
 
-TEST(v_multiset, check)
+TEST(vector_multiset, check)
 {
   std::vector<int> v;
   hack::container::vector_multiset(v, 1, 2, 3);
   ASSERT_EQ(v.at(0), 1);
 }
+
+TEST(matches, check)
+{
+  std::vector<int> v { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+  ASSERT_EQ(hack::container::matches(v, 2, 5, 4, 12), 3);
+}