diff --git a/analyse.py b/analyse.py
old mode 100644
new mode 100755
diff --git a/combine.py b/combine.py
new file mode 100755
index 0000000..5290ce1
--- /dev/null
+++ b/combine.py
@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+import json
+from logger import logger
+
+
+def loadData(catalog: dict) -> dict:
+    data = {}
+    for _, pageId in catalog.items():
+        data[pageId] = json.loads(
+            open('./json/%s.json' % pageId).read()
+        )
+    return data
+
+
+def listDiff(list_1: list, list_2: list) -> bool:
+    diffFlag = False
+    if len(list_1) != len(list_2):
+        diffFlag = True
+        logger.error('List with different length')
+    for i in range(0, len(list_1)):
+        if list_1[i] != list_2[i]:
+            diffFlag = True
+            logger.error('List diff: `%s` <-> `%s`' % (list_1[i], list_2[i]))
+    return diffFlag
+
+
+def check(catalog: dict, data: dict) -> None:
+    titles = [x['title'] for _, x in data.items()]
+    ids = [x['myId'] for _, x in data.items()]
+    preIds = [x['preId'] for _, x in data.items()]
+    nextIds = [x['nextId'] for _, x in data.items()]
+    nextIds.pop(-1)
+    preIds.pop(0)
+
+    # if listDiff(ids, preIds + [ids[-1]]):
+    #     logger.warning('Pre IDs mismatch')
+    # if listDiff(ids, [ids[0]] + nextIds):
+    #     logger.warning('Next IDs mismatch')
+    if listDiff(ids, [x for _, x in catalog.items()]):
+        logger.warning('IDs mismatch')
+    if listDiff(titles, [x for x in catalog]):
+        logger.warning('Titles mismatch')
+
+
+def combine() -> dict:
+    catalog = json.loads(open('./catalog/catalog.json').read())
+    data = loadData(catalog)
+    check(catalog, data)
+
+    result = {}
+    for _, info in data.items():
+        result[info['title']] = info['contents']
+    return result
+
+
+print(json.dumps(combine()))
diff --git a/fetch.py b/fetch.py
old mode 100644
new mode 100755