diff --git a/ddp.py b/ddp.py
index cb24dbb..4046ef4 100755
--- a/ddp.py
+++ b/ddp.py
@@ -5,12 +5,22 @@ import itertools
 import os
 import sys
 import threading
+import time
 
 
 GET_ALL_PICS_LIST_STRING="find . -iname '*.jpg' -o -iname '*.png' -o -iname '*.jpeg'"
 COMPARE_PICS_CMD="compare -metric AE -fuzz 0.1% \"{}\" \"{}\" /dev/null"
+IDENTIFY_PIC_CMD="identify \"{}\""
 
 PICS_MAP_SQUSHED = {}
+PICS_MAP_SQUSHED_KEYS = []
+
+THREADS_CTX = {
+    "keys": [],
+    "estimated": 0,
+    "num": 2,
+    "done": []
+}
 
 def main():
     out = subprocess.Popen(['sh', '-c', GET_ALL_PICS_LIST_STRING],
@@ -18,6 +28,18 @@ def main():
     all_pics_string = out.communicate()[0].decode('utf-8')
     all_pics = all_pics_string.split('\n')
     print(f"Gathered {len(all_pics)} photos.")
+    count = 0
+    try:
+        with open('./.ddp.csv', 'r') as done_file:
+            for line in done_file.readlines():
+                line = line.strip('\n')
+                if not line:
+                    continue
+                THREADS_CTX["done"].append(line)
+                count += 1
+    except FileNotFoundError as err:
+        print(err)
+    print(f"Exclude list for {count} keys")
 
     # I. basenames
     pics_map = {}
@@ -53,42 +75,73 @@ def main():
             pics_map_keys.remove(squashed_key)
 
     print(f"Squashed hashtable to {len(pics_map_squashed)} keys.")
+    PICS_MAP_SQUSHED.update(pics_map_squashed)
+    THREADS_CTX["keys"] = [key for key in list(PICS_MAP_SQUSHED.keys()) if key not in THREADS_CTX["done"]]
+    THREADS_CTX["estimated"] = len(THREADS_CTX["keys"])
+    threads = [None] * THREADS_CTX["num"]
+    for i in range(THREADS_CTX["num"]):
+        threads[i] = threading.Thread(target=thread_function, args=(f"thread_{i}",))
+        threads[i].start()
+    try:
+        while THREADS_CTX["keys"]:
+            time.sleep(.1)
+    except KeyboardInterrupt as err:
+        print("Wait for threads...")
+        THREADS_CTX["keys"] = []
+    for i in range(THREADS_CTX["num"]):
+        threads[i].join()
+    with open('./.ddp.csv', 'w') as done_file:
+        for key in THREADS_CTX["done"]:
+            done_file.write(key + "\n")
 
-    estimated = len(pics_map_squashed)
-    for pics in pics_map_squashed.values():
-        if estimated % 10 == 0:
-            print(f"Estimated: {estimated}")
-        print(f"Do {len(pics)} photos: '{pics}'")
-        estimated -= 1
-        delete_list = []
-        compars_count = 0
-        for pic_a, pic_b in itertools.combinations(pics, 2):
-            if pic_b in delete_list or pic_a in delete_list:
-                continue
-            if not os.path.exists(pic_a):
-                print(f"pic_a doesnt exist: '{pic_a}'")
-                continue
-            if not os.path.exists(pic_b):
-                print(f"pic_b doesnt exist: '{pic_b}'")
-                continue
-            compars_count += 1
-            out = subprocess.Popen(['sh', '-c', COMPARE_PICS_CMD.format(pic_a, pic_b)],
-                                   stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
-            value_string, stderr = out.communicate()
-            if out.returncode >= 2:
-                print(f"HERE!!! stdout: {value_string}\nstderr: {stderr}\nreturn code: {out.returncode}")
+
+def thread_function(name):
+    try:
+        prev_key = None
+        while key := THREADS_CTX["keys"].pop(0):
+            if prev_key:
+                THREADS_CTX["done"].append(prev_key)
+            prev_key = key
+            pics = PICS_MAP_SQUSHED[key]
+            if THREADS_CTX["estimated"] % 10 == 0:
+                print(f"Estimated: {THREADS_CTX['estimated']}")
+            print(f"{name}: Do {len(pics)} photos: '{pics}'")
+            THREADS_CTX["estimated"] -= 1
+            delete_list = []
+            compars_count = 0
+            for pic_a, pic_b in itertools.combinations(pics, 2):
+                if pic_b in delete_list or pic_a in delete_list:
+                    continue
+                if not os.path.exists(pic_a):
+                    print(f"pic_a doesnt exist: '{pic_a}'")
+                    continue
+                if not os.path.exists(pic_b):
+                    print(f"pic_b doesnt exist: '{pic_b}'")
+                    continue
+                compars_count += 1
+                out = subprocess.Popen(['sh', '-c', COMPARE_PICS_CMD.format(pic_a, pic_b)],
+                                       stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
+                value_string, stderr = out.communicate()
+                if out.returncode >= 2:
+                    print(f"HERE!!! stdout: {value_string}\nstderr: {stderr}\nreturn code: {out.returncode}")
+                    continue
+                #diff = float(value_string.decode('utf-8'))
+                #if diff == 0.:
+                if out.returncode == 0:
+                    delete_list.append(pic_b)
+
+            print(f"{name}: {compars_count} cmps")
+            if not delete_list:
                 continue
-            #diff = float(value_string.decode('utf-8'))
-            #if diff == 0.:
-            if out.returncode == 0:
-                delete_list.append(pic_b)
+            print(f"Delete: {delete_list}")
+            for delete_elem in delete_list:
+                os.remove(delete_elem)
+    except BaseException as err:
+        print(f"{name}: {err}")
 
-        print(f"Cmps: {compars_count}")
-        if not delete_list:
-            continue
-        print(f"Delete: {delete_list}")
-        for delete_elem in delete_list:
-            os.remove(delete_elem)
+    # Handle last key
+    if prev_key:
+        THREADS_CTX["done"].append(prev_key)
 
 
 if __name__ == '__main__':