diff --git a/klotski/main.cc b/klotski/main.cc
index 4146404..193dc57 100644
--- a/klotski/main.cc
+++ b/klotski/main.cc
@@ -30,47 +30,48 @@ int main(int argc, char *argv[]) {
 //    printf("%09lX\n", s.unzip_short_code(14323231));
 
 
+    uint32_t start_code = atoi(argv[1]);
+    uint32_t end_code = atoi(argv[2]);
+
 //    std::cout << "preparing..." << std::endl;
-//    std::vector<uint64_t> all_cases;
-//    auto a = AllCases(AllCases::ALL_CASES);
-//    for (int head = 0; head < 16; ++head) {
-//        uint64_t prefix = (uint64_t)head << 32;
-//        for (const auto &range : (*a.get_all_cases())[head]) {
-//            all_cases.emplace_back(prefix | range);
-//        }
-//    }
-//
-////    auto s = ShortCode(ShortCode::Mode::NORMAL);
+    std::vector<uint64_t> all_cases;
+    auto a = AllCases(AllCases::ALL_CASES);
+    for (int head = 0; head < 16; ++head) {
+        uint64_t prefix = (uint64_t)head << 32;
+        for (const auto &range : (*a.get_all_cases())[head]) {
+            all_cases.emplace_back(prefix | range);
+        }
+    }
+
+    auto s = ShortCode(ShortCode::Mode::NORMAL);
 //    auto s = ShortCode(ShortCode::Mode::FAST);
 //    std::cout << "start working" << std::endl;
-//
-//    for (auto short_code = 0; short_code < all_cases.size(); ++short_code) {
-//        uint64_t common_code = all_cases[short_code];
-//
-//        if (short_code != s.zip_short_code(common_code)) {
-//            printf("ERROR: zip %d\n", short_code);
-//        }
-//        if (common_code != s.unzip_short_code(short_code)) {
-//            printf("ERROR: unzip %09lX\n", common_code);
-//        }
-//
+
+    for (auto short_code = start_code; short_code < end_code + 1; ++short_code) {
+
+        uint64_t common_code = all_cases[short_code];
+
+        if (short_code != s.zip_short_code(common_code)) {
+            printf("ERROR: zip %d\n", short_code);
+        }
+        if (common_code != s.unzip_short_code(short_code)) {
+            printf("ERROR: unzip %09lX\n", common_code);
+        }
+
 //        if (short_code % 2000000 == 0) {
-////        if (short_code % 10000 == 0) {
+//        if (short_code % 10000 == 0) {
 //            std::cout << ((float)short_code / (float)all_cases.size() * 100) << "%" << std::endl;
 //        }
-//    }
+    }
 //    std::cout << "complete verify" << std::endl;
+    std::cout << "[" << start_code << ", " << end_code << "]," << std::endl;
 
 
-//    0 ~ 29334497
-    uint32_t start_code = atoi(argv[1]);
-    uint32_t end_code = atoi(argv[2]);
-
-    for (uint32_t short_code = start_code; short_code < end_code + 1; ++short_code) {
-        if (short_code != ShortCode::code_from_string(ShortCode::code_to_string(short_code))) {
-            std::cout << "ERROR: " << short_code << std::endl;
-        }
-    }
+//    for (uint32_t short_code = 0; short_code < 29334498; ++short_code) {
+//        if (short_code != ShortCode::code_from_string(ShortCode::code_to_string(short_code))) {
+//            std::cout << "ERROR: " << short_code << std::endl;
+//        }
+//    }
 
 //    std::cout << ShortCode::code_to_string(14323231) << std::endl;
 //    std::cout << ShortCode::code_from_string("EP4HZ") << std::endl;
diff --git a/verify.py b/verify.py
new file mode 100755
index 0000000..bab04e2
--- /dev/null
+++ b/verify.py
@@ -0,0 +1,33 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import sys
+import subprocess
+
+process_list = []
+CASE_NUMBER = 29334
+# CASE_NUMBER = 29334498
+thread_num = int(sys.argv[1])
+sub_length = ((CASE_NUMBER - 1) // thread_num) + 1
+
+
+def run_check(start_code: int, end_code: int) -> None:
+    print('[%d, %d] -> %d' % (start_code, end_code, end_code - start_code + 1))
+    process_list.append(
+        subprocess.Popen(['./klotski', str(start_code), str(end_code)])
+    )
+
+
+start = 0
+for i in range(0, thread_num):
+    if i + 1 == thread_num:
+        end = CASE_NUMBER - 1
+    else:
+        end = start + sub_length - 1
+    run_check(start, end)
+    start += sub_length
+
+print('-' * 64)
+
+for process in process_list:
+    process.wait()