diff --git a/all_cases/short_code.cc b/all_cases/short_code.cc
index ca2c06e..e117aab 100644
--- a/all_cases/short_code.cc
+++ b/all_cases/short_code.cc
@@ -57,9 +57,8 @@ uint32_t code_from_string(const std::string &short_code) {
 int main() {
 
     auto a = AllCases();
+    a.find_all_cases();
 
-//    a.find_all_cases();
-//
 //    std::vector<uint64_t> all_cases;
 //    for (int n = 0; n < 16; ++n) {
 //        uint64_t prefix = (uint64_t)n << 32;
@@ -73,7 +72,7 @@ int main() {
 //        all_cases_dict[all_cases[i]] = i;
 //    }
 
-    uint32_t short_code = 14323231;
+//    uint32_t short_code = 14323231;
 //    printf("%09lX\n", all_cases[0]);
 //    printf("%09lX\n", all_cases[short_code]);
 //    printf("%09lX\n", all_cases[ALL_CASES_NUMBER - 1]);
@@ -86,27 +85,71 @@ int main() {
     // 0 <= short_code < ALL_CASES_NUMBER
 
 //    uint32_t short_code = 5203298;
-    int head = 0;
-    for (; head < 16; ++head) {
-        if (short_code < ALL_CASES_SIZE[head]) {
-            break;
-        }
-        short_code -= ALL_CASES_SIZE[head];
-    }
-    std::cout << "head: " << head << std::endl;
-    std::cout << "sub short code: " << short_code << std::endl;
-
-    int index = 0;
-    for (auto &range : a.basic_ranges) {
-        if (AllCases::check_case(head, range)) {
-            if (index == short_code) {
-                printf("%08X\n", AllCases::binary_reverse(range));
-                break;
-            }
-            ++index;
-        }
+//    int head = 0;
+//    for (; head < 16; ++head) {
+//        if (short_code < ALL_CASES_SIZE[head]) {
+//            break;
+//        }
+//        short_code -= ALL_CASES_SIZE[head];
+//    }
+//    std::cout << "head: " << head << std::endl;
+//    std::cout << "sub short code: " << short_code << std::endl;
+//
+//    int index = 0;
+//    for (auto &range : a.basic_ranges) {
+//        if (AllCases::check_case(head, range)) {
+//            if (index == short_code) {
+//                printf("%08X\n", AllCases::binary_reverse(range));
+//                break;
+//            }
+//            ++index;
+//        }
+//    }
+
+    // group size => 256 => 8-bits
+
+    // min range -> xx * 7 -> 14-bits
+
+    // 00 00 00 00 ...  =>  ... 00 00 00 00
+    // 00 00 00 01 ...  =>  ... 01 00 00 00
+    // 00 00 00 10 ...  =>  ... 10 00 00 00
+    // 00 00 00 11 ...  =>  ... 11 00 00 00
+    // ...
+
+    // ...00000000 -> 0
+    // ...01000000 -> ...
+    // ...10000000 -> ...
+    // ...11000000 -> ...
+
+    // record start search point
+
+    std::cout << a.all_cases[6].size() << std::endl;
+//    printf("%08X\n", a.all_cases[6][0]);
+//    printf("%08X\n", a.all_cases[6][1]);
+//    printf("%08X\n", a.all_cases[6][2]);
+
+    uint32_t index[256] = {0};
+    for (auto &range : a.all_cases[6]) {
+        ++index[range >> 24];
     }
 
+    std::cout << "00: " << index[0x00] << std::endl;
+    std::cout << "01: " << index[0x01] << std::endl;
+    std::cout << "7D: " << index[0x7D] << std::endl;
+    std::cout << "7E: " << index[0x7E] << std::endl;
+    std::cout << "7F: " << index[0x7F] << std::endl;
+    std::cout << "FE: " << index[0xFE] << std::endl;
+    std::cout << "FF: " << index[0xFF] << std::endl;
+
+    // 1131628 -> 7C FF FF F0
+    // 1131629 -> 7D 00 00 00
+    // ...
+    // 1140029 -> 7D FF FF 00
+    // 1140030 -> 7E 00 00 00
+    // ...
+    // 1147413 -> 7E FF FF 00
+    // 1147414 -> 7F 00 00 00
+
 //    std::cout << code_to_string(14323231) << std::endl;
 //    std::cout << code_from_string("8IzVj") << std::endl;