diff --git a/klotski/main.cc b/klotski/main.cc
index 4822f18..a9a2c8d 100644
--- a/klotski/main.cc
+++ b/klotski/main.cc
@@ -19,12 +19,15 @@ int main() {
 
     auto s = ShortCode();
 
-    s.speed_up();
+//    s.speed_up(ShortCode::Mode::FAST);
 //    std::cout << s.all_cases_list.size() << std::endl;
 //    std::cout << s.all_cases_dict.size() << std::endl;
 
-    printf("%d\n", s.fast_encode(0x6EC0F8800));
-    printf("%09lX\n", s.fast_decode(14323231));
+//    printf("%d\n", s.fast_encode(0x6EC0F8800));
+//    printf("%09lX\n", s.fast_decode(14323231));
+
+    s.speed_up(ShortCode::Mode::NORMAL);
+    std::cout << s.basic_ranges.size() << std::endl;
 
     return 0;
 }
diff --git a/klotski/short_code.cc b/klotski/short_code.cc
index 2f39f99..6e93d61 100644
--- a/klotski/short_code.cc
+++ b/klotski/short_code.cc
@@ -2,7 +2,12 @@
 #include "short_code.h"
 #include "short_code_mark.h"
 
-void ShortCode::build_mapping() { // build fast search mapping
+void ShortCode::build_base_ranges() {
+    auto all = AllCases(AllCases::InitType::WITH_BASIC_RANGES);
+    basic_ranges = *all.get_basic_ranges();
+}
+
+void ShortCode::build_mappings() { // build fast search mapping
     auto all = AllCases(AllCases::InitType::WITH_ALL_CASES);
     for (int head = 0; head < 16; ++head) {
         uint64_t prefix = (uint64_t)head << 32;
@@ -15,9 +20,18 @@ void ShortCode::build_mapping() { // build fast search mapping
     }
 }
 
-void ShortCode::speed_up() { // speed up for zip / unzip short code
-    if (all_cases_list.empty()) {
-        build_mapping();
+void ShortCode::speed_up(enum Mode mode) { // speed up handle short code
+    switch (mode) {
+        case Mode::NORMAL: // speed up into normal mode
+            if (basic_ranges.empty()) {
+                build_base_ranges(); // basic ranges initialize
+            }
+            break;
+        case Mode::FAST: // speed up into fast mode
+            if (all_cases_list.empty()) {
+                build_mappings(); // all cases mapping initialize
+            }
+            break;
     }
 }
 
diff --git a/klotski/short_code.h b/klotski/short_code.h
index 8a49694..a6d0cf4 100644
--- a/klotski/short_code.h
+++ b/klotski/short_code.h
@@ -7,10 +7,14 @@
 class ShortCode {
 public:
 
+    enum Mode {NORMAL, FAST};
+
+    std::vector<uint32_t> basic_ranges;
+
     std::vector<uint64_t> all_cases_list;                  // short_code -> common_code
     std::unordered_map<uint64_t, uint32_t> all_cases_dict; // common_code -> short_code
 
-    void speed_up();
+    void speed_up(enum Mode mode);
 
 //    uint32_t zip_short_code(uint64_t code);
 //    uint64_t unzip_short_code(uint32_t short_code);
@@ -18,11 +22,14 @@ public:
     uint64_t fast_decode(uint32_t short_code);
     uint32_t fast_encode(uint64_t common_code);
 
+    uint64_t tiny_decode(uint32_t short_code);
+    uint32_t tiny_encode(uint64_t common_code);
+
 private:
 //    std::vector<uint64_t> all_cases_list;                  // short_code -> common_code
 //    std::unordered_map<uint64_t, uint32_t> all_cases_dict; // common_code -> short_code
 
-    void build_mapping();
-
+    void build_mappings();
+    void build_base_ranges();
 
 };