diff --git a/src/analyse/analyse.cc b/src/analyse/analyse.cc
index b0361c4..269eede 100644
--- a/src/analyse/analyse.cc
+++ b/src/analyse/analyse.cc
@@ -249,10 +249,15 @@ void Analyse::new_case(uint64_t code, uint64_t mask) {
 
     auto current = cases.find(code);
     if (current != cases.end()) { // find existed case
-        current->second.mask |= mask; // update mask info
 
-        if (current->second.step != cache.front()->step) {
-            current->second.src.push_back(cache.front());
+        if (current->second.step == cache.front()->step + 1) {
+
+            current->second.mask |= mask; // update mask info
+
+            if (current->second.step != cache.front()->step) {
+                current->second.src.push_back(cache.front());
+            }
+
         }
 
         return;
diff --git a/src/main.cc b/src/main.cc
index 2cf2b77..415b699 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -212,17 +212,17 @@ int main() {
 //    };
 //    a.backtrack(raw_codes);
 
-//    std::vector<uint64_t> raw_codes = {
-//        CommonCode("DE77D80").to_raw_code().unwrap(),
-//        CommonCode("DF6DD80").to_raw_code().unwrap(),
-//        CommonCode("DF69730").to_raw_code().unwrap(),
-//        CommonCode("DE76D30").to_raw_code().unwrap(),
-//        CommonCode("D5AF730").to_raw_code().unwrap(),
-//        CommonCode("D5B43BC").to_raw_code().unwrap(),
-//    };
     std::vector<uint64_t> raw_codes = {
-        CommonCode("EF697C0").to_raw_code().unwrap(),
+        CommonCode("DE77D80").to_raw_code().unwrap(),
+        CommonCode("DF6DD80").to_raw_code().unwrap(),
+        CommonCode("DF69730").to_raw_code().unwrap(),
+        CommonCode("DE76D30").to_raw_code().unwrap(),
+        CommonCode("D5AF730").to_raw_code().unwrap(),
+        CommonCode("D5B43BC").to_raw_code().unwrap(),
     };
+//    std::vector<uint64_t> raw_codes = {
+//        CommonCode("EF697C0").to_raw_code().unwrap(),
+//    };
     // TODO: FATAL ERROR -> don't using mask in Analyse
     a.backtrack(raw_codes);
 
diff --git a/svg-demo/demo.yml b/svg-demo/demo.yml
deleted file mode 100644
index f4f504b..0000000
--- a/svg-demo/demo.yml
+++ /dev/null
@@ -1,79 +0,0 @@
-layer:
-- [[[0,0,1,2],[2,0,1,2],[0,1,1,1],[1,1,1,2],[0,2,1,1],[1,2,2,1],[2,2,2,2],[0,3,2,1],[1,4,1,1],[2,4,1,1]]] # layer 0
-- [[[0,0,1,2],[2,0,1,2],[0,1,1,1],[2,1,1,2],[0,2,1,1],[1,2,2,1],[2,2,2,2],[0,3,2,1],[1,4,1,1],[2,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,1,1],[1,1,1,2],[0,2,1,1],[1,2,2,1],[2,2,2,2],[0,3,2,1],[1,4,1,1],[3,4,1,1]]] # layer 1
-- [[[0,0,1,2],[2,0,1,2],[0,1,1,1],[1,1,2,1],[2,1,1,2],[0,2,1,1],[2,2,2,2],[0,3,2,1],[1,4,1,1],[2,4,1,1]],[[0,0,1,2],[2,0,1,2],[1,1,1,1],[2,1,1,2],[0,2,1,1],[1,2,2,1],[2,2,2,2],[0,3,2,1],[1,4,1,1],[2,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,1,1],[2,1,1,2],[0,2,1,1],[1,2,2,1],[2,2,2,2],[0,3,2,1],[1,4,1,1],[3,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,1,1],[1,1,1,2],[0,2,1,1],[1,2,2,1],[2,2,2,2],[0,3,2,1],[2,4,1,1],[3,4,1,1]]] # layer 2
-- [[[0,0,1,2],[2,0,1,2],[0,1,1,1],[1,1,2,1],[2,1,1,2],[0,2,1,1],[2,2,2,2],[0,3,2,1],[1,3,1,1],[2,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,1,1],[1,1,1,1],[2,1,1,2],[1,2,2,1],[2,2,2,2],[0,3,2,1],[1,4,1,1],[2,4,1,1]],[[0,0,1,2],[2,0,1,2],[1,1,1,1],[2,1,1,2],[0,2,1,1],[1,2,2,1],[2,2,2,2],[0,3,2,1],[1,4,1,1],[3,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,1,1],[2,1,1,2],[0,2,1,1],[1,2,2,1],[2,2,2,2],[0,3,2,1],[2,4,1,1],[3,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,1,1],[1,1,1,2],[0,2,1,1],[2,2,2,2],[0,3,2,1],[1,3,2,1],[2,4,1,1],[3,4,1,1]]] # layer 3
-- [[[0,0,1,2],[2,0,1,2],[0,1,1,1],[1,1,2,1],[2,1,1,2],[0,2,1,1],[2,2,2,2],[0,3,2,1],[1,3,1,1],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,1,1],[1,1,1,1],[2,1,1,2],[0,2,2,1],[1,2,2,1],[2,2,2,2],[1,4,1,1],[2,4,1,1]],[[0,0,1,2],[2,0,1,2],[1,1,1,1],[2,1,1,2],[0,2,1,1],[1,2,2,1],[2,2,2,2],[0,3,2,1],[2,4,1,1],[3,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,1,1],[2,1,1,2],[0,2,1,1],[2,2,2,2],[0,3,2,1],[1,3,2,1],[2,4,1,1],[3,4,1,1]]] # layer 4
-- [[[0,0,1,2],[2,0,1,2],[0,1,1,1],[1,1,2,1],[2,1,1,2],[0,2,1,1],[0,3,2,1],[1,3,1,1],[2,3,2,2],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,1,1],[1,1,1,1],[2,1,1,2],[0,2,2,1],[1,2,2,1],[2,2,2,2],[0,4,1,1],[2,4,1,1]],[[0,0,1,2],[2,0,1,2],[1,1,1,1],[2,1,1,2],[0,2,1,1],[2,2,2,2],[0,3,2,1],[1,3,2,1],[2,4,1,1],[3,4,1,1]],[[0,0,1,2],[2,0,1,2],[2,1,1,2],[0,2,1,1],[1,2,1,1],[2,2,2,2],[0,3,2,1],[1,3,2,1],[2,4,1,1],[3,4,1,1]]] # layer 5
-- [[[0,0,1,2],[2,0,1,2],[0,1,1,1],[1,1,2,1],[0,2,1,1],[2,2,1,2],[0,3,2,1],[1,3,1,1],[2,3,2,2],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,1,1],[1,1,1,1],[2,1,1,2],[0,2,2,1],[1,2,2,1],[2,2,2,2],[0,4,1,1],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[1,1,1,1],[2,1,1,2],[1,2,1,1],[2,2,2,2],[0,3,2,1],[1,3,2,1],[2,4,1,1],[3,4,1,1]]] # layer 6
-- [[[0,0,1,2],[0,1,1,1],[1,1,2,1],[2,1,1,2],[0,2,1,1],[2,2,1,2],[0,3,2,1],[1,3,1,1],[2,3,2,2],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,1,1],[1,1,1,1],[2,1,1,2],[0,2,2,1],[1,2,2,1],[2,3,2,2],[0,4,1,1],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,2,1],[1,1,1,1],[2,1,1,2],[1,2,1,1],[2,2,2,2],[1,3,2,1],[2,4,1,1],[3,4,1,1]]] # layer 7
-- [[[2,0,1,2],[0,1,1,1],[1,1,2,1],[2,1,1,2],[0,2,1,1],[2,2,1,2],[0,3,2,1],[1,3,1,1],[2,3,2,2],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,1,1],[1,1,1,1],[0,2,2,1],[1,2,2,1],[2,2,1,2],[2,3,2,2],[0,4,1,1],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,2,1],[1,1,1,1],[2,1,1,2],[1,2,1,1],[2,2,2,2],[0,3,2,1],[2,4,1,1],[3,4,1,1]]] # layer 8
-- [[[0,0,1,1],[2,0,1,2],[1,1,2,1],[2,1,1,2],[0,2,1,1],[2,2,1,2],[0,3,2,1],[1,3,1,1],[2,3,2,2],[1,4,1,1]],[[1,0,2,1],[2,0,1,2],[0,1,1,1],[2,1,1,2],[0,2,1,1],[2,2,1,2],[0,3,2,1],[1,3,1,1],[2,3,2,2],[1,4,1,1]],[[1,0,1,1],[2,0,1,2],[1,1,2,1],[2,1,1,2],[0,2,1,1],[2,2,1,2],[0,3,2,1],[1,3,1,1],[2,3,2,2],[1,4,1,1]],[[0,0,1,2],[0,1,1,1],[1,1,1,1],[2,1,1,2],[0,2,2,1],[1,2,2,1],[2,2,1,2],[2,3,2,2],[0,4,1,1],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,1,1],[3,1,1,1],[0,2,2,1],[1,2,2,1],[2,2,1,2],[2,3,2,2],[0,4,1,1],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,2,1],[1,1,1,1],[2,1,1,2],[2,2,2,2],[0,3,2,1],[1,4,1,1],[2,4,1,1],[3,4,1,1]]] # layer 9
-- [[[0,0,1,1],[1,0,2,1],[2,0,1,2],[2,1,1,2],[0,2,1,1],[2,2,1,2],[0,3,2,1],[1,3,1,1],[2,3,2,2],[1,4,1,1]],[[0,0,1,1],[2,0,1,2],[0,1,1,1],[1,1,2,1],[2,1,1,2],[2,2,1,2],[0,3,2,1],[1,3,1,1],[2,3,2,2],[1,4,1,1]],[[0,0,1,1],[1,0,1,1],[2,0,1,2],[1,1,2,1],[2,1,1,2],[2,2,1,2],[0,3,2,1],[1,3,1,1],[2,3,2,2],[1,4,1,1]],[[2,0,1,2],[0,1,1,1],[1,1,1,1],[2,1,1,2],[0,2,2,1],[1,2,2,1],[2,2,1,2],[2,3,2,2],[0,4,1,1],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[2,1,1,1],[3,1,1,1],[0,2,2,1],[1,2,2,1],[2,2,1,2],[2,3,2,2],[0,4,1,1],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,2,1],[1,1,1,1],[2,1,1,2],[1,2,2,2],[0,3,2,1],[1,4,1,1],[2,4,1,1],[3,4,1,1]]] # layer 10
-- [[[0,0,1,1],[1,0,2,1],[2,0,1,2],[0,1,1,1],[2,1,1,2],[2,2,1,2],[0,3,2,1],[1,3,1,1],[2,3,2,2],[1,4,1,1]],[[0,0,1,1],[1,0,1,1],[2,0,1,2],[0,1,2,1],[2,1,1,2],[2,2,1,2],[0,3,2,1],[1,3,1,1],[2,3,2,2],[1,4,1,1]],[[0,0,1,1],[1,0,1,1],[2,0,1,2],[0,1,2,1],[1,1,2,1],[2,1,1,2],[2,2,1,2],[1,3,1,1],[2,3,2,2],[1,4,1,1]],[[0,0,1,1],[2,0,1,2],[0,1,1,1],[2,1,1,2],[0,2,2,1],[1,2,2,1],[2,2,1,2],[2,3,2,2],[0,4,1,1],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,2,1],[2,1,1,1],[3,1,1,1],[1,2,2,1],[2,2,1,2],[2,3,2,2],[0,4,1,1],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[1,1,2,1],[2,1,1,1],[3,1,1,1],[0,2,2,1],[2,2,1,2],[2,3,2,2],[0,4,1,1],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,2,1],[1,1,1,1],[2,1,1,2],[1,2,2,2],[3,2,1,1],[0,3,2,1],[1,4,1,1],[2,4,1,1]]] # layer 11
-- [[[0,0,1,1],[1,0,2,1],[2,0,1,2],[0,1,1,1],[2,1,1,2],[0,2,1,1],[2,2,1,2],[0,3,2,1],[2,3,2,2],[1,4,1,1]],[[0,0,1,1],[1,0,1,1],[2,0,1,2],[0,1,2,1],[1,1,1,1],[2,1,1,2],[2,2,1,2],[0,3,2,1],[2,3,2,2],[1,4,1,1]],[[0,0,1,1],[1,0,1,1],[2,0,1,2],[0,1,2,1],[1,1,2,1],[2,1,1,2],[2,2,1,2],[0,3,1,1],[2,3,2,2],[1,4,1,1]],[[0,0,1,1],[1,0,1,1],[2,0,1,2],[0,1,2,1],[1,1,2,1],[2,1,1,2],[2,2,1,2],[2,3,2,2],[0,4,1,1],[1,4,1,1]],[[0,0,1,1],[1,0,2,1],[2,0,1,2],[0,1,1,1],[2,1,1,2],[0,2,2,1],[2,2,1,2],[2,3,2,2],[0,4,1,1],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,2,1],[1,1,2,1],[2,1,1,1],[3,1,1,1],[2,2,1,2],[2,3,2,2],[0,4,1,1],[1,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,2,1],[1,1,1,1],[2,1,1,2],[1,2,2,2],[3,2,1,1],[0,3,2,1],[3,3,1,1],[1,4,1,1]]] # layer 12
-- [[[0,0,1,1],[1,0,2,1],[2,0,1,2],[0,1,1,1],[2,1,1,2],[0,2,1,1],[1,2,1,1],[2,2,1,2],[0,3,2,1],[2,3,2,2]],[[0,0,1,1],[1,0,1,1],[2,0,1,2],[0,1,2,1],[1,1,1,1],[2,1,1,2],[1,2,1,1],[2,2,1,2],[0,3,2,1],[2,3,2,2]],[[0,0,1,1],[1,0,1,1],[2,0,1,2],[0,1,2,1],[1,1,2,1],[2,1,1,2],[2,2,1,2],[0,3,1,1],[2,3,2,2],[0,4,1,1]],[[0,0,1,1],[1,0,2,1],[2,0,1,2],[0,1,1,1],[2,1,1,2],[0,2,2,1],[1,2,1,1],[2,2,1,2],[2,3,2,2],[0,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,2,1],[1,1,2,1],[2,1,1,1],[3,1,1,1],[2,2,1,2],[0,3,1,1],[2,3,2,2],[0,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,2,1],[1,1,1,1],[2,1,1,2],[1,2,2,2],[3,2,1,1],[0,3,2,1],[3,3,1,1],[3,4,1,1]]] # layer 13
-- [[[0,0,1,1],[1,0,2,1],[2,0,1,2],[0,1,1,1],[2,1,1,2],[0,2,1,1],[1,2,1,1],[2,2,1,2],[0,3,2,1],[1,3,2,2]],[[0,0,1,1],[1,0,1,1],[2,0,1,2],[0,1,2,1],[1,1,1,1],[2,1,1,2],[1,2,1,1],[2,2,1,2],[0,3,2,1],[1,3,2,2]],[[0,0,1,1],[1,0,1,1],[2,0,1,2],[0,1,2,1],[1,1,2,1],[2,1,1,2],[2,2,1,2],[0,3,1,1],[1,3,2,2],[0,4,1,1]],[[0,0,1,1],[1,0,2,1],[2,0,1,2],[0,1,1,1],[2,1,1,2],[0,2,2,1],[1,2,1,1],[2,2,1,2],[1,3,2,2],[0,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,2,1],[1,1,2,1],[2,1,1,1],[3,1,1,1],[2,2,1,2],[0,3,1,1],[1,3,2,2],[0,4,1,1]],[[0,0,1,2],[2,0,1,2],[0,1,2,1],[1,1,1,1],[2,1,1,2],[3,2,1,1],[0,3,2,1],[1,3,2,2],[3,3,1,1],[3,4,1,1]]] # layer 14
-
-next:
-- - [0,1] # (0, 0) -> 1
-- - [0,1,2] # (1, 0) -> 2
-  - [2,3] # (1, 1) -> 2
-- - [0] # (2, 0) -> 3
-  - [1,2] # (2, 1) -> 3
-  - [2,3] # (2, 2) -> 3
-  - [3,4] # (2, 3) -> 3
-- - [0] # (3, 0) -> 4
-  - [1] # (3, 1) -> 4
-  - [2] # (3, 2) -> 4
-  - [2,3] # (3, 3) -> 4
-  - [3] # (3, 4) -> 4
-- - [0] # (4, 0) -> 5
-  - [1] # (4, 1) -> 5
-  - [2] # (4, 2) -> 5
-  - [2,3] # (4, 3) -> 5
-- - [0] # (5, 0) -> 6
-  - [1] # (5, 1) -> 6
-  - [2] # (5, 2) -> 6
-  - [2] # (5, 3) -> 6
-- - [0] # (6, 0) -> 7
-  - [1] # (6, 1) -> 7
-  - [2] # (6, 2) -> 7
-- - [0] # (7, 0) -> 8
-  - [1] # (7, 1) -> 8
-  - [2] # (7, 2) -> 8
-- - [0,1,2] # (8, 0) -> 9
-  - [3,4] # (8, 1) -> 9
-  - [5] # (8, 2) -> 9
-- - [0,1] # (9, 0) -> 10
-  - [0] # (9, 1) -> 10
-  - [2] # (9, 2) -> 10
-  - [3] # (9, 3) -> 10
-  - [4] # (9, 4) -> 10
-  - [5] # (9, 5) -> 10
-- - [0] # (10, 0) -> 11
-  - [0] # (10, 1) -> 11
-  - [1,2] # (10, 2) -> 11
-  - [3] # (10, 3) -> 11
-  - [4,5] # (10, 4) -> 11
-  - [6] # (10, 5) -> 11
-- - [0] # (11, 0) -> 12
-  - [1] # (11, 1) -> 12
-  - [2,3] # (11, 2) -> 12
-  - [4] # (11, 3) -> 12
-  - [5] # (11, 4) -> 12
-  - [5] # (11, 5) -> 12
-  - [6] # (11, 6) -> 12
-- - [0] # (12, 0) -> 13
-  - [1] # (12, 1) -> 13
-  - [2] # (12, 2) -> 13
-  - [2] # (12, 3) -> 13
-  - [3] # (12, 4) -> 13
-  - [4] # (12, 5) -> 13
-  - [5] # (12, 6) -> 13
-- - [0] # (13, 0) -> 14
-  - [1] # (13, 1) -> 14
-  - [2] # (13, 2) -> 14
-  - [3] # (13, 3) -> 14
-  - [4] # (13, 4) -> 14
-  - [5] # (13, 5) -> 14