diff --git a/src/core/common_code/internal/common_code.inl b/src/core/common_code/internal/common_code.inl
index 3fb3b25..f80f3b6 100644
--- a/src/core/common_code/internal/common_code.inl
+++ b/src/core/common_code/internal/common_code.inl
@@ -138,3 +138,18 @@ constexpr auto operator<=>(const CommonCode &lhs, const CommonCode &rhs) {
 // ----------------------------------------------------------------------------------------- //
 
 } // namespace klotski::codec
+
+// ----------------------------------------------------------------------------------------- //
+
+namespace std {
+
+template <>
+struct std::hash<klotski::codec::CommonCode> {
+    constexpr std::size_t operator()(const klotski::codec::CommonCode &c) const noexcept {
+        return std::hash<uint64_t>{}(c.unwrap());
+    }
+};
+
+} // namespace std
+
+// ----------------------------------------------------------------------------------------- //
diff --git a/src/core/main.cc b/src/core/main.cc
index d26256d..fbf5365 100644
--- a/src/core/main.cc
+++ b/src/core/main.cc
@@ -32,6 +32,7 @@ using klotski::cases::GroupCases;
 using klotski::cases::GroupUnion;
 
 using klotski::cases::TYPE_ID_LIMIT;
+using klotski::cases::ALL_CASES_NUM_;
 using klotski::codec::SHORT_CODE_LIMIT;
 
 int main() {
@@ -42,6 +43,23 @@ int main() {
 
     const auto start = std::chrono::system_clock::now();
 
+    ShortCode::speed_up(true);
+
+    std::unordered_set<RawCode> data_r;
+    std::unordered_set<ShortCode> data_s;
+    std::unordered_set<CommonCode> data_c;
+    data_r.reserve(ALL_CASES_NUM_);
+    data_s.reserve(ALL_CASES_NUM_);
+    data_c.reserve(ALL_CASES_NUM_);
+    for (auto code : AllCases::instance().fetch().codes()) {
+        data_c.emplace(code);
+        data_r.emplace(code.to_raw_code());
+        data_s.emplace(code.to_short_code());
+    }
+    std::cout << data_r.size() << std::endl;
+    std::cout << data_s.size() << std::endl;
+    std::cout << data_c.size() << std::endl;
+
 //    const auto common_code = CommonCode::unsafe_create(0x1A9BF0C00);
 //    const auto group = Group::from_common_code(common_code);
 
diff --git a/src/core/raw_code/internal/raw_code.inl b/src/core/raw_code/internal/raw_code.inl
index b530e15..17d6756 100644
--- a/src/core/raw_code/internal/raw_code.inl
+++ b/src/core/raw_code/internal/raw_code.inl
@@ -94,3 +94,18 @@ constexpr auto operator<=>(const RawCode &lhs, const RawCode &rhs) {
 // ----------------------------------------------------------------------------------------- //
 
 } // namespace klotski::codec
+
+// ----------------------------------------------------------------------------------------- //
+
+namespace std {
+
+template <>
+struct std::hash<klotski::codec::RawCode> {
+    constexpr std::size_t operator()(const klotski::codec::RawCode &r) const noexcept {
+        return std::hash<uint64_t>{}(r.unwrap());
+    }
+};
+
+} // namespace std
+
+// ----------------------------------------------------------------------------------------- //
diff --git a/src/core/short_code/internal/short_code.inl b/src/core/short_code/internal/short_code.inl
index c0b031b..1546092 100644
--- a/src/core/short_code/internal/short_code.inl
+++ b/src/core/short_code/internal/short_code.inl
@@ -116,3 +116,18 @@ constexpr auto operator<=>(const ShortCode &lhs, const ShortCode &rhs) {
 // ----------------------------------------------------------------------------------------- //
 
 } // namespace klotski::codec
+
+// ----------------------------------------------------------------------------------------- //
+
+namespace std {
+
+template <>
+struct std::hash<klotski::codec::ShortCode> {
+    constexpr std::size_t operator()(const klotski::codec::ShortCode &s) const noexcept {
+        return std::hash<uint32_t>{}(s.unwrap());
+    }
+};
+
+} // namespace std
+
+// ----------------------------------------------------------------------------------------- //