diff --git a/libs/derive_string.py b/libs/derive_string.py
index b59771e..0b18952 100644
--- a/libs/derive_string.py
+++ b/libs/derive_string.py
@@ -4,6 +4,7 @@ from hashlib import sha3_256
 from itertools import count
 from Crypto.Cipher import ChaCha20
 from math import floor, ceil
+from time import sleep
 
 def chacha_bits(input, bit_count):
     zerobyte = (0).to_bytes(length=1, byteorder='big')
@@ -11,23 +12,35 @@ def chacha_bits(input, bit_count):
     i = 0
 
     while True:
+        print('-----------------------------')
         start_bit = bit_count * i
         start_byte = start_bit // 8
         start_padding = start_bit % 8
+        print('start_bit', start_bit)
+        print('start_byte', start_byte)
+        print('start_padding', start_padding)
 
         end_bit = bit_count * i + bit_count
         end_byte = end_bit // 8
         end_padding = 8 - (end_bit % 8)
-
-        byte_count = end_byte - start_byte
+        print('end_bit', end_bit)
+        print('end_byte', end_byte)
+        print('end_padding', end_padding)
+        
+        byte_count = (end_byte - start_byte) + 1
+        print('byte_count', byte_count)
 
         cipher.seek(start_byte)
         ciphertext = cipher.encrypt(zerobyte*byte_count)
+        print('ciphertext', bin(int.from_bytes(ciphertext, byteorder='big')))
         shifted_ciphertext = int.from_bytes(ciphertext, byteorder='big') >> end_padding
+        print('shifted_ciphertext', bin(shifted_ciphertext))
         
         bit_mask = int('1'*bit_count, 2)
+        print('bit_mask', bin(bit_mask))
         masked_ciphertext = shifted_ciphertext & bit_mask
-        
+        print('masked_ciphertext', bin(masked_ciphertext))
+
         yield masked_ciphertext
         i += 1
 
@@ -46,5 +59,5 @@ def derive_string(input, length, choices):
     return ''.join(next(get_character) for i in range(length))
 
 print(
-    derive_string(b'12345', length=100, choices='abcde12345')
+    derive_string(b'12345', length=100, choices='abcdefghijklmnopqrstuvwxyz0123456789')
 )