diff --git a/src/fast_cal/fast_cal.cc b/src/fast_cal/fast_cal.cc
index e981b7b..9f4cf42 100644
--- a/src/fast_cal/fast_cal.cc
+++ b/src/fast_cal/fast_cal.cc
@@ -54,6 +54,15 @@ std::vector<std::vector<RawCode>> FastCal::resolve_multi(RawCode start) {
     return FastCal::search_multi(start, resolved);
 }
 
+std::vector<std::vector<RawCode>> FastCal::to_furthest(RawCode start) {
+    auto fc = FastCal();
+    std::vector<std::vector<RawCode>> result;
+    for (const auto &furthest : fc.furthest(start)) {
+        result.emplace_back(fc.backtrack(furthest)); // backtrack every furthest cases
+    }
+    return result;
+}
+
 std::vector<RawCode> FastCal::search(RawCode start, const match_t &match) {
     auto fc = FastCal();
     auto result = fc.target(start, match);
@@ -66,8 +75,8 @@ std::vector<RawCode> FastCal::search(RawCode start, const match_t &match) {
 std::vector<std::vector<RawCode>> FastCal::search_multi(RawCode start, const match_t &match) {
     auto fc = FastCal();
     std::vector<std::vector<RawCode>> result;
-    for (const auto &c : fc.target_multi(start, match)) {
-        result.emplace_back(fc.backtrack(c)); // backtrack every target
+    for (const auto &target : fc.target_multi(start, match)) {
+        result.emplace_back(fc.backtrack(target)); // backtrack every target
     }
     return result;
 }
diff --git a/src/fast_cal/fast_cal.h b/src/fast_cal/fast_cal.h
index 22e2b2d..ad51b49 100644
--- a/src/fast_cal/fast_cal.h
+++ b/src/fast_cal/fast_cal.h
@@ -28,15 +28,14 @@ public:
     std::vector<RawCode> target_multi(RawCode code, const match_t &match);
 
     /// static BFS search functions
-    // TODO: (RawCode code) -> (const RawCode &code)
-//    static std::vector<RawCode> get_furthest(RawCode start);
-
     static std::vector<RawCode> resolve(RawCode start);
-    static std::vector<RawCode> search(RawCode start, const match_t &match);
-
+    static std::vector<std::vector<RawCode>> to_furthest(RawCode start);
     static std::vector<std::vector<RawCode>> resolve_multi(RawCode start);
+    static std::vector<RawCode> search(RawCode start, const match_t &match);
     static std::vector<std::vector<RawCode>> search_multi(RawCode start, const match_t &match);
 
+    // TODO: (RawCode code) -> (const RawCode &code)
+
 private:
     struct fast_cal_t {
         uint64_t code;
diff --git a/src/main.cc b/src/main.cc
index 8d03fc6..6fd91d9 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -49,11 +49,11 @@ int main() {
 //        std::cout << c << std::endl;
 //    }
 
-    for (const auto &s : FastCal::resolve_multi(RawCode::from_common_code("1a9bf0c"))) {
-//        for (const auto &c : s) {
-//            std::cout << c << std::endl;
-//        }
-//        std::cout << "--------------------------------------------" << std::endl;
+    for (const auto &s : FastCal::to_furthest(RawCode::from_common_code("1a9bf0c"))) {
+        for (const auto &c : s) {
+            std::cout << c << std::endl;
+        }
+        std::cout << "--------------------------------------------" << std::endl;
     }
 
 //    std::cout << f.step_num(ret) << std::endl;