diff --git a/unit02_symmetric/lab/possible_ans.md b/unit02_symmetric/lab/possible_ans.md
index 3f5ad07..60cf6a7 100644
--- a/unit02_symmetric/lab/possible_ans.md
+++ b/unit02_symmetric/lab/possible_ans.md
@@ -1,96 +1,5 @@
 
 
-##  Q1
-You may need to install "Crypto" with:
-<pre>
-pip install pycrypto
-</pre>
-And Padding with:
-<pre>
-pip install padding
-</pre>
-
-Note: The Padding library has not implemented the fully range of padding methods.
-
-```python
-from Crypto.Cipher import AES
-import hashlib
-import sys
-import binascii
-import Padding
-
-val='hello'
-password='hello'
-
-plaintext=val
-
-def encrypt(plaintext,key, mode):
-	encobj = AES.new(key,mode)
-	return(encobj.encrypt(plaintext))
-
-def decrypt(ciphertext,key, mode):
-	encobj = AES.new(key,mode)
-	return(encobj.decrypt(ciphertext))
-
-key = hashlib.sha256(password.encode()).digest()
-
-
-plaintext = Padding.appendPadding(plaintext,blocksize=Padding.AES_blocksize,mode='CMS')
-
-print ("After padding (CMS): ",binascii.hexlify(bytearray(plaintext.encode())))
-
-ciphertext = encrypt(plaintext.encode(),key,AES.MODE_ECB)
-print ("Cipher (ECB): ",binascii.hexlify(bytearray(ciphertext)))
-
-plaintext = decrypt(ciphertext,key,AES.MODE_ECB)
-plaintext = Padding.removePadding(plaintext.decode(),mode='CMS')
-print ("  decrypt: ",plaintext)
-
-
-plaintext=val
-
-### Other padding methods have not been implemented in the library
-
-plaintext = Padding.appendPadding(plaintext,blocksize=Padding.AES_blocksize,mode='ZeroLen')
-
-print ("After padding (CMS): ",binascii.hexlify(bytearray(plaintext.encode())))
-
-ciphertext = encrypt(plaintext.encode(),key,AES.MODE_ECB)
-print ("Cipher (ECB): ",binascii.hexlify(bytearray(ciphertext)))
-
-plaintext = decrypt(ciphertext,key,AES.MODE_ECB)
-plaintext = Padding.removePadding(plaintext.decode(),mode='ZeroLen')
-print ("  decrypt: ",plaintext)
-
-plaintext=val
-
-plaintext = Padding.appendPadding(plaintext,blocksize=Padding.AES_blocksize,mode='Space')
-
-print ("After padding (CMS): ",binascii.hexlify(bytearray(plaintext.encode())))
-
-ciphertext = encrypt(plaintext.encode(),key,AES.MODE_ECB)
-print ("Cipher (ECB): ",binascii.hexlify(bytearray(ciphertext)))
-
-plaintext = decrypt(ciphertext,key,AES.MODE_ECB)
-plaintext = Padding.removePadding(plaintext.decode(),mode='Space')
-print ("  decrypt: ",plaintext)
-
-
-plaintext=val
-
-plaintext = Padding.appendPadding(plaintext,blocksize=Padding.AES_blocksize,mode='Random')
-
-print ("After padding (Random): ",binascii.hexlify(bytearray(plaintext.encode())))
-
-ciphertext = encrypt(plaintext.encode(),key,AES.MODE_ECB)
-print ("Cipher (ECB): ",binascii.hexlify(bytearray(ciphertext)))
-
-plaintext = decrypt(ciphertext,key,AES.MODE_ECB)
-plaintext = Padding.removePadding(plaintext.decode(),mode='Random')
-print ("  decrypt: ",plaintext)
-```
-An example is [here](https://repl.it/@billbuchanan/ch02ans01#main.py).
-
 
 
 ## Q2