diff --git a/day9/common.py b/day9/common.py
index dec84a9..33c90b3 100644
--- a/day9/common.py
+++ b/day9/common.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 from dataclasses import dataclass
-import sys
+import logging
 from typing import List, Self
 
 
@@ -29,9 +29,10 @@ class OASISLine:
         ]
 
     def reduce(self) -> Self:
-        # sys.stderr.write("=".join(["" for i in range(40)])+"\n")
+        logging.debug(color.RED + f"reducing {self.sequence}" + color.END)
+        logging.debug(color.BLUE + "=".join(["" for i in range(40)]) + color.END)
         line = self.sequence
-        # sys.stderr.write(str(line)+"\n")
+        logging.debug(str(line))
         while not all(map(lambda i: i == 0, line)):
             new_line = []
             for idx, number in enumerate(line):
@@ -39,44 +40,43 @@ class OASISLine:
                     new_line.append(number - line[idx - 1])
             line = new_line
             self.reduce_map.append(line)
-            # sys.stderr.write(str(line)+"\n")
-        # sys.stderr.write("=".join(["" for i in range(40)])+"\n")
+            logging.debug(str(line))
+        logging.debug(color.BLUE + "=".join(["" for i in range(40)]) + color.END)
         return self
 
     def extrapolate(self):
-        # sys.stderr.write("\n" + color.BLUE + "=".join(["" for i in range(40)]) + color.END + "\n")
+        logging.debug(color.RED + f"extrapolating {self.sequence}" + color.END)
+        logging.debug(color.BLUE + "=".join(["" for i in range(40)]) + color.END)
         next_increment = 0
         for line in reversed(self.reduce_map):
-            # sys.stderr.write(str(line))
             if all(map(lambda i: i == line[0], line)):
                 next_increment = line[0]
             else:
                 next_increment = line[len(line) - 1] + next_increment
-            # sys.stderr.write(color.BOLD + f" {next_increment}" + color.END + "\n")
-        # sys.stderr.write(color.BLUE + "=".join(["" for i in range(40)]) + color.END + "\n")
+            logging.debug(str(line) + " " + color.BOLD + color.GREEN + f" {next_increment}" + color.END + "\n")
+        logging.debug(color.BLUE + "=".join(["" for i in range(40)]) + color.END)
         return next_increment
-    
+
     def extrapolate_back(self):
-        sys.stderr.write("\n" + color.BLUE + "=".join(["" for i in range(40)]) + color.END + "\n")
+        logging.debug(color.RED + f"extrapolating back {self.sequence}" + color.END)
+        logging.debug(color.BLUE + "=".join(["" for i in range(40)]) + color.END)
         next_increment = 0
         for line in reversed(self.reduce_map):
             if all(map(lambda i: i == line[0], line)):
                 next_increment = line[0]
             else:
                 next_increment = line[0] - next_increment
-            sys.stderr.write(color.BOLD + f"{next_increment} " + color.END + str(line) + "\n")
-        sys.stderr.write(color.BLUE + "=".join(["" for i in range(40)]) + color.END + "\n")
+            logging.debug(color.BOLD + color.GREEN + f"{next_increment} " + color.END + str(line))
+        logging.debug(color.BLUE + "=".join(["" for i in range(40)]) + color.END)
         return next_increment
 
-
     @classmethod
     def parse(cls, input_file: str) -> List[OASISLine]:
-        # sys.stderr.write("\n")
         the_list = []
         with open(input_file) as input:
             while line := input.readline():
                 line = line.rstrip("\n").rstrip()
-                # sys.stderr.write(color.RED + f'parsing "{line}"' + color.END + "\n")
+                logging.debug(color.RED + f'parsing "{line}"' + color.END)
                 the_list.append(OASISLine(line))
-                # sys.stderr.write(color.GREEN + f"parsed {the_list[len(the_list) - 1]}" + color.END + "\n")
+                logging.debug(color.GREEN + f"parsed {the_list[len(the_list) - 1].sequence}" + color.END)
         return the_list
diff --git a/day9/test.py b/day9/test.py
old mode 100644
new mode 100755
index cb753b0..db0ce5a
--- a/day9/test.py
+++ b/day9/test.py
@@ -1,5 +1,7 @@
+#!/usr/bin/env python3.11
 import unittest
 from common import OASISLine
+import logging
 
 
 class Day9Tests(unittest.TestCase):
@@ -13,5 +15,7 @@ class Day9Tests(unittest.TestCase):
         extrapolation = map(lambda o: o.reduce().extrapolate_back(), analysis)
         self.assertEqual(sum(extrapolation), 2)
 
+
 if __name__ == "__main__":
-    unittest.main()
+    logging.basicConfig(level=logging.DEBUG)
+    unittest.main(verbosity=2)