diff --git a/DIRECTORY.md b/DIRECTORY.md
index 04b785b2b..e807644b6 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -45,9 +45,11 @@
   * [Morse Code Implementation](https://github.com/TheAlgorithms/Python/blob/master/ciphers/morse_code_implementation.py)
   * [Onepad Cipher](https://github.com/TheAlgorithms/Python/blob/master/ciphers/onepad_cipher.py)
   * [Playfair Cipher](https://github.com/TheAlgorithms/Python/blob/master/ciphers/playfair_cipher.py)
+  * [Porta Cipher](https://github.com/TheAlgorithms/Python/blob/master/ciphers/porta_cipher.py)
   * [Rabin Miller](https://github.com/TheAlgorithms/Python/blob/master/ciphers/rabin_miller.py)
   * [Rot13](https://github.com/TheAlgorithms/Python/blob/master/ciphers/rot13.py)
   * [Rsa Cipher](https://github.com/TheAlgorithms/Python/blob/master/ciphers/rsa_cipher.py)
+  * [Rsa Factorization](https://github.com/TheAlgorithms/Python/blob/master/ciphers/rsa_factorization.py)
   * [Rsa Key Generator](https://github.com/TheAlgorithms/Python/blob/master/ciphers/rsa_key_generator.py)
   * [Shuffled Shift Cipher](https://github.com/TheAlgorithms/Python/blob/master/ciphers/shuffled_shift_cipher.py)
   * [Simple Substitution Cipher](https://github.com/TheAlgorithms/Python/blob/master/ciphers/simple_substitution_cipher.py)
@@ -94,7 +96,9 @@
     * [Min Heap](https://github.com/TheAlgorithms/Python/blob/master/data_structures/heap/min_heap.py)
   * Linked List
     * [Doubly Linked List](https://github.com/TheAlgorithms/Python/blob/master/data_structures/linked_list/doubly_linked_list.py)
+    * [From Sequence](https://github.com/TheAlgorithms/Python/blob/master/data_structures/linked_list/from_sequence.py)
     * [Is Palindrome](https://github.com/TheAlgorithms/Python/blob/master/data_structures/linked_list/is_palindrome.py)
+    * [Print Reverse](https://github.com/TheAlgorithms/Python/blob/master/data_structures/linked_list/print_reverse.py)
     * [Singly Linked List](https://github.com/TheAlgorithms/Python/blob/master/data_structures/linked_list/singly_linked_list.py)
     * [Swap Nodes](https://github.com/TheAlgorithms/Python/blob/master/data_structures/linked_list/swap_nodes.py)
   * Queue
@@ -238,6 +242,7 @@
   * [Basic Maths](https://github.com/TheAlgorithms/Python/blob/master/maths/basic_maths.py)
   * [Binary Exponentiation](https://github.com/TheAlgorithms/Python/blob/master/maths/binary_exponentiation.py)
   * [Binomial Coefficient](https://github.com/TheAlgorithms/Python/blob/master/maths/binomial_coefficient.py)
+  * [Ceil](https://github.com/TheAlgorithms/Python/blob/master/maths/ceil.py)
   * [Collatz Sequence](https://github.com/TheAlgorithms/Python/blob/master/maths/collatz_sequence.py)
   * [Explicit Euler](https://github.com/TheAlgorithms/Python/blob/master/maths/explicit_euler.py)
   * [Extended Euclidean Algorithm](https://github.com/TheAlgorithms/Python/blob/master/maths/extended_euclidean_algorithm.py)
@@ -251,6 +256,7 @@
   * [Find Max Recursion](https://github.com/TheAlgorithms/Python/blob/master/maths/find_max_recursion.py)
   * [Find Min](https://github.com/TheAlgorithms/Python/blob/master/maths/find_min.py)
   * [Find Min Recursion](https://github.com/TheAlgorithms/Python/blob/master/maths/find_min_recursion.py)
+  * [Floor](https://github.com/TheAlgorithms/Python/blob/master/maths/floor.py)
   * [Gaussian](https://github.com/TheAlgorithms/Python/blob/master/maths/gaussian.py)
   * [Greatest Common Divisor](https://github.com/TheAlgorithms/Python/blob/master/maths/greatest_common_divisor.py)
   * [Hardy Ramanujanalgo](https://github.com/TheAlgorithms/Python/blob/master/maths/hardy_ramanujanalgo.py)
@@ -317,7 +323,6 @@
   * [Detecting English Programmatically](https://github.com/TheAlgorithms/Python/blob/master/other/detecting_english_programmatically.py)
   * [Euclidean Gcd](https://github.com/TheAlgorithms/Python/blob/master/other/euclidean_gcd.py)
   * [Fischer Yates Shuffle](https://github.com/TheAlgorithms/Python/blob/master/other/fischer_yates_shuffle.py)
-  * [Food Wastage Analysis From 1961-2013 Fao](https://github.com/TheAlgorithms/Python/blob/master/other/food_wastage_analysis_from_1961-2013_fao.ipynb)
   * [Frequency Finder](https://github.com/TheAlgorithms/Python/blob/master/other/frequency_finder.py)
   * [Game Of Life](https://github.com/TheAlgorithms/Python/blob/master/other/game_of_life.py)
   * [Greedy](https://github.com/TheAlgorithms/Python/blob/master/other/greedy.py)
@@ -353,6 +358,7 @@
   * Problem 03
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_03/sol1.py)
     * [Sol2](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_03/sol2.py)
+    * [Sol3](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_03/sol3.py)
   * Problem 04
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_04/sol1.py)
     * [Sol2](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_04/sol2.py)
@@ -371,6 +377,7 @@
   * Problem 08
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_08/sol1.py)
     * [Sol2](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_08/sol2.py)
+    * [Sol3](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_08/sol3.py)
   * Problem 09
     * [Sol1](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_09/sol1.py)
     * [Sol2](https://github.com/TheAlgorithms/Python/blob/master/project_euler/problem_09/sol2.py)
@@ -506,16 +513,133 @@
 ## Strings
   * [Aho-Corasick](https://github.com/TheAlgorithms/Python/blob/master/strings/aho-corasick.py)
   * [Boyer Moore Search](https://github.com/TheAlgorithms/Python/blob/master/strings/boyer_moore_search.py)
+  * [Check Panagram](https://github.com/TheAlgorithms/Python/blob/master/strings/check_panagram.py)
   * [Knuth Morris Pratt](https://github.com/TheAlgorithms/Python/blob/master/strings/knuth_morris_pratt.py)
   * [Levenshtein Distance](https://github.com/TheAlgorithms/Python/blob/master/strings/levenshtein_distance.py)
   * [Manacher](https://github.com/TheAlgorithms/Python/blob/master/strings/manacher.py)
   * [Min Cost String Conversion](https://github.com/TheAlgorithms/Python/blob/master/strings/min_cost_string_conversion.py)
   * [Naive String Search](https://github.com/TheAlgorithms/Python/blob/master/strings/naive_string_search.py)
   * [Rabin Karp](https://github.com/TheAlgorithms/Python/blob/master/strings/rabin_karp.py)
+  * [Remove Duplicate](https://github.com/TheAlgorithms/Python/blob/master/strings/remove_duplicate.py)
 
 ## Traversals
   * [Binary Tree Traversals](https://github.com/TheAlgorithms/Python/blob/master/traversals/binary_tree_traversals.py)
 
+## Venv
+  * Lib
+    * Python3.7
+      * Site-Packages
+        * Certifi
+          * [  Main  ](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/certifi/__main__.py)
+          * [Core](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/certifi/core.py)
+        * Chardet
+          * [Big5Freq](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/big5freq.py)
+          * [Big5Prober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/big5prober.py)
+          * [Chardistribution](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/chardistribution.py)
+          * [Charsetgroupprober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/charsetgroupprober.py)
+          * [Charsetprober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/charsetprober.py)
+          * Cli
+            * [Chardetect](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/cli/chardetect.py)
+          * [Codingstatemachine](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/codingstatemachine.py)
+          * [Compat](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/compat.py)
+          * [Cp949Prober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/cp949prober.py)
+          * [Enums](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/enums.py)
+          * [Escprober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/escprober.py)
+          * [Escsm](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/escsm.py)
+          * [Eucjpprober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/eucjpprober.py)
+          * [Euckrfreq](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/euckrfreq.py)
+          * [Euckrprober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/euckrprober.py)
+          * [Euctwfreq](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/euctwfreq.py)
+          * [Euctwprober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/euctwprober.py)
+          * [Gb2312Freq](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/gb2312freq.py)
+          * [Gb2312Prober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/gb2312prober.py)
+          * [Hebrewprober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/hebrewprober.py)
+          * [Jisfreq](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/jisfreq.py)
+          * [Jpcntx](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/jpcntx.py)
+          * [Langbulgarianmodel](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/langbulgarianmodel.py)
+          * [Langcyrillicmodel](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/langcyrillicmodel.py)
+          * [Langgreekmodel](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/langgreekmodel.py)
+          * [Langhebrewmodel](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/langhebrewmodel.py)
+          * [Langhungarianmodel](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/langhungarianmodel.py)
+          * [Langthaimodel](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/langthaimodel.py)
+          * [Langturkishmodel](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/langturkishmodel.py)
+          * [Latin1Prober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/latin1prober.py)
+          * [Mbcharsetprober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/mbcharsetprober.py)
+          * [Mbcsgroupprober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/mbcsgroupprober.py)
+          * [Mbcssm](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/mbcssm.py)
+          * [Sbcharsetprober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/sbcharsetprober.py)
+          * [Sbcsgroupprober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/sbcsgroupprober.py)
+          * [Sjisprober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/sjisprober.py)
+          * [Universaldetector](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/universaldetector.py)
+          * [Utf8Prober](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/utf8prober.py)
+          * [Version](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/chardet/version.py)
+        * Idna
+          * [Codec](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/idna/codec.py)
+          * [Compat](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/idna/compat.py)
+          * [Core](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/idna/core.py)
+          * [Idnadata](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/idna/idnadata.py)
+          * [Intranges](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/idna/intranges.py)
+          * [Package Data](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/idna/package_data.py)
+          * [Uts46Data](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/idna/uts46data.py)
+        * [Ordered Set](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/ordered_set.py)
+        * Pip-19.0.3-Py3.7.Egg
+          * Pip
+            * [  Main  ](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/pip-19.0.3-py3.7.egg/pip/__main__.py)
+        * Requests
+          * [  Version  ](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/__version__.py)
+          * [ Internal Utils](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/_internal_utils.py)
+          * [Adapters](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/adapters.py)
+          * [Api](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/api.py)
+          * [Auth](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/auth.py)
+          * [Certs](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/certs.py)
+          * [Compat](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/compat.py)
+          * [Cookies](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/cookies.py)
+          * [Exceptions](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/exceptions.py)
+          * [Help](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/help.py)
+          * [Hooks](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/hooks.py)
+          * [Models](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/models.py)
+          * [Packages](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/packages.py)
+          * [Sessions](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/sessions.py)
+          * [Status Codes](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/status_codes.py)
+          * [Structures](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/structures.py)
+          * [Utils](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/requests/utils.py)
+        * Urllib3
+          * [ Collections](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/_collections.py)
+          * [Connection](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/connection.py)
+          * [Connectionpool](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/connectionpool.py)
+          * Contrib
+            * [ Appengine Environ](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/contrib/_appengine_environ.py)
+            * [Appengine](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/contrib/appengine.py)
+            * [Ntlmpool](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/contrib/ntlmpool.py)
+            * [Pyopenssl](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/contrib/pyopenssl.py)
+            * [Securetransport](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/contrib/securetransport.py)
+            * [Socks](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/contrib/socks.py)
+          * [Exceptions](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/exceptions.py)
+          * [Fields](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/fields.py)
+          * [Filepost](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/filepost.py)
+          * Packages
+            * Backports
+              * [Makefile](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/packages/backports/makefile.py)
+            * [Six](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/packages/six.py)
+            * Ssl Match Hostname
+              * [ Implementation](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/packages/ssl_match_hostname/_implementation.py)
+          * [Poolmanager](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/poolmanager.py)
+          * [Request](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/request.py)
+          * [Response](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/response.py)
+          * Util
+            * [Connection](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/util/connection.py)
+            * [Queue](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/util/queue.py)
+            * [Request](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/util/request.py)
+            * [Response](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/util/response.py)
+            * [Retry](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/util/retry.py)
+            * [Ssl ](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/util/ssl_.py)
+            * [Timeout](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/util/timeout.py)
+            * [Url](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/util/url.py)
+            * [Wait](https://github.com/TheAlgorithms/Python/blob/master/venv/lib/python3.7/site-packages/urllib3/util/wait.py)
+
 ## Web Programming
   * [Crawl Google Results](https://github.com/TheAlgorithms/Python/blob/master/web_programming/crawl_google_results.py)
+  * [Fetch Bbc News](https://github.com/TheAlgorithms/Python/blob/master/web_programming/fetch_bbc_news.py)
+  * [Fetch Github Info](https://github.com/TheAlgorithms/Python/blob/master/web_programming/fetch_github_info.py)
   * [Get Imdbtop](https://github.com/TheAlgorithms/Python/blob/master/web_programming/get_imdbtop.py)
+  * [Slack Message](https://github.com/TheAlgorithms/Python/blob/master/web_programming/slack_message.py)
diff --git a/strings/remove_duplicate.py b/strings/remove_duplicate.py
new file mode 100644
index 000000000..0462292b7
--- /dev/null
+++ b/strings/remove_duplicate.py
@@ -0,0 +1,20 @@
+# Created by sarathkaul on 14/11/19
+
+
+def remove_duplicates(sentence: str) -> str:
+    """
+    Reomove duplicates from sentence
+    >>> remove_duplicates("Python is great and Java is also great")
+    'Java Python also and great is'
+    """
+    sen_list = sentence.split(" ")
+    check = set()
+
+    for a_word in sen_list:
+        check.add(a_word)
+
+    return " ".join(sorted(check))
+
+
+if __name__ == "__main__":
+    print(remove_duplicates("INPUT_SENTENCE"))