diff --git a/src/klotski_core/ffi/tmain.cc b/src/klotski_core/ffi/tmain.cc
index cd2dd92..bc349fe 100644
--- a/src/klotski_core/ffi/tmain.cc
+++ b/src/klotski_core/ffi/tmain.cc
@@ -25,72 +25,28 @@ using klotski::BasicRanges;
 
 void tmain() {
 
-//    std::vector<CommonCode> ok;
-//    for (auto &&c : AllCases::release()) {
-//        if (Group::type_id(c) == 123) {
-//            ok.emplace_back(c);
-//        }
-//    }
-//    std::cout << ok.size() << std::endl;
-
-//    std::cout << Group::all_cases(123).size() << std::endl;
-//    std::vector<CommonCode> err;
-//    auto ret = Group::all_cases(123);
-//    std::cout << ret.size() << std::endl;
-//    err.reserve(ret.size());
-//    for (auto &&r : ret) {
-//        if (Group::type_id(r) != 123) {
-//            std::cout << r << std::endl;
-//        }
-//        err.emplace_back(r);
-//    }
-
 //    uint32_t sum = 0;
 //    for (uint32_t type_id = 0; type_id < 204; ++type_id) {
 //        sum += Group::all_cases(type_id).size();
-//        auto tmp = Group::block_num(type_id);
-//
-//        std::vector<uint32_t> ranges;
-//
-//        BasicRanges::generate(ranges, BasicRanges::generate_t { // generate target ranges
-//            .n1 = 16 - tmp.n_1x1 - (tmp.n_1x2 + tmp.n_2x1) * 2, /// space -> 00
-//            .n2 = tmp.n_1x2, /// 1x2 -> 01
-//            .n3 = tmp.n_2x1, /// 2x1 -> 10
-//            .n4 = tmp.n_1x1, /// 1x1 -> 11
-//        });
-//        sum += ranges.size();
 //    }
 //    std::cout << "sum = " << sum << std::endl;
 
-
-    uint32_t sum = 0;
     for (uint32_t type_id = 0; type_id < 204; ++type_id) {
-        sum += Group::all_cases(type_id).size();
-    }
-    std::cout << "sum = " << sum << std::endl;
 
+        std::vector<uint64_t> codes;
+        std::vector<uint64_t> codes_;
+        for (auto &&t : Group::all_cases(type_id)) {
+            codes.emplace_back(t.unwrap());
+            codes_.emplace_back(t.unwrap());
+        }
+        std::sort(codes.begin(), codes.end());
 
-//    auto r = Group::block_num(123);
-
-//    std::cout << (int)r.n_1x1 << " " << (int)r.n_1x2 << " " << (int)r.n_2x1 << std::endl;
-
-//    std::cout << Group::type_id(r) << std::endl;
-
-//    Group::block_num(CommonCode(0x1A9BF0C00));
-//    Group::block_num(RawCode::from_common_code(0x1A9BF0C00));
-
-//    std::cout << std::endl;
-
-//    Group::block_num(CommonCode(0x4FEA13400));
-//    Group::block_num(RawCode::from_common_code(0x4FEA13400));
+        if (codes != codes_) {
+            std::cout << type_id << std::endl;
+        }
+//        std::cout << (codes == codes_) << std::endl;
 
-//    for (auto &&common_code : AllCases::release()) {
-//        auto s1 = Group::block_num(common_code);
-//        auto s2 = Group::block_num(common_code.to_raw_code());
-//        if (s1.n_1x1 != s2.n_1x1 || s1.n_1x2 != s2.n_1x2 || s1.n_2x1 != s2.n_2x1) {
-//            std::cout << "fuck" << std::endl;
-//        }
-//    }
+    }
 
 //    auto cases = std::vector<RawCode>();
 //    auto common_codes = AllCases::release();
diff --git a/src/klotski_core/group/group.cc b/src/klotski_core/group/group.cc
index 3439742..e316f1f 100644
--- a/src/klotski_core/group/group.cc
+++ b/src/klotski_core/group/group.cc
@@ -14,46 +14,34 @@ using klotski::Common::check_range;
 using klotski::Common::range_reverse;
 
 std::vector<CommonCode> Group::all_cases(uint32_t type_id) {
-
     auto tmp = block_num(type_id);
-
-    std::vector<uint32_t> ranges;
-
+    std::vector<uint32_t> ranges; // basic ranges of type_id
     BasicRanges::generate(ranges, BasicRanges::generate_t { // generate target ranges
         .n1 = 16 - tmp.n_1x1 - (tmp.n_1x2 + tmp.n_2x1) * 2, /// space -> 00
         .n2 = tmp.n_1x2, /// 1x2 -> 01
         .n3 = tmp.n_2x1, /// 2x1 -> 10
         .n4 = tmp.n_1x1, /// 1x1 -> 11
     });
-
     for (auto &range : ranges) {
         range = range_reverse(range); // basic ranges reversed
     }
 
-//    std::cout << ranges.size() << std::endl;
-
     std::vector<CommonCode> all_cases;
-
+    // TODO: all_cases pre-allocated
     for (uint64_t head = 0; head < 15; ++head) { // address of 2x2 block
         /// head -> 0/1/2 / 4/5/6 / 8/9/10 / 12/13/14
         if ((head & 0b11) == 0b11) {
             ++head; // skip invalid address
         }
-
         /// head(4-bit) + basic-range(32-bit) --check--> valid cases
         for (auto &&range : ranges) {
-
             if (!check_range(head, range)) { // case valid
-                all_cases.emplace_back(CommonCode::create(
-
-                        head << 32 | range_reverse(range)
-
-                        ));
-//                range_reverse(range); // release valid cases
+                all_cases.emplace_back(CommonCode::unsafe_create(
+                    head << 32 | range_reverse(range) // release valid cases
+                ));
             }
         }
     }
-
     return all_cases;
 }
 
@@ -88,7 +76,4 @@ std::vector<RawCode> Group::group_cases(const RawCode &seed) {
     return result;
 }
 
-
-
-
 } // namespace klotski