diff --git a/labs04/examples/06_execution_time.py b/labs04/examples/06_execution_time.py
new file mode 100755
index 0000000..7fa34a7
--- /dev/null
+++ b/labs04/examples/06_execution_time.py
@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+ExecutionTime
+
+This class is used for timing execution of code.
+
+For example:
+
+    timer = ExecutionTime()
+    print 'Hello world!'
+    print 'Finished in {} seconds.'.format(timer.duration())
+
+"""
+
+
+import time
+import random
+
+
+class ExecutionTime:
+    def __init__(self):
+        self.start_time = time.time()
+
+    def duration(self):
+        return time.time() - self.start_time
+
+
+# ---- run code ---- #
+
+
+timer = ExecutionTime()
+sample_list = list()
+my_list = [random.randint(1, 888898) for num in
+           range(1, 1000000) if num % 2 == 0]
+print('Finished in {} seconds.'.format(timer.duration()))
diff --git a/labs04/examples/25_ip2geolocation.py b/labs04/examples/25_ip2geolocation.py
new file mode 100755
index 0000000..89ab872
--- /dev/null
+++ b/labs04/examples/25_ip2geolocation.py
@@ -0,0 +1,31 @@
+import csv
+import requests
+
+
+def get_address():
+    """
+    Given a CSV file, this function returns a list of lists
+    where each element (list) in the outer list contains the
+    row info from the csv file.
+    """
+    all_addresses = [requests.get('http://ip.42.pl/raw').text.strip()]
+    return all_addresses
+
+
+def get_geolocation(ip_address):
+    """
+    Given a list of lists from `get_addresses()`, this function
+    returns an updated lists of lists containing the geolocation.
+    """
+    print("Getting geo information...")
+    # update header
+    # get geolocation
+    for line in all_the_ip_address:
+        print("Grabbing geo info")
+        r = requests.get('https://freegeoip.net/json/{0}'.format(line))
+        print([str(r.json()['country_name']), str(r.json()['city'])])
+
+
+if __name__ == '__main__':
+    all_the_ip_address = get_address()
+    get_geolocation(all_the_ip_address)
diff --git a/labs04/examples/fib.py b/labs04/examples/fib.py
new file mode 100644
index 0000000..5cf8223
--- /dev/null
+++ b/labs04/examples/fib.py
@@ -0,0 +1,47 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Obliczenie n-tego wyrazu ciągu fibonacciego na dwa sposoby.
+1. Naiwna rekurencja: podstawienie do wzoru.
+2. Wersja z cachem: każdy wyraz jest obliczany dokładnie raz.
+"""
+
+def naive_fibonacci(n):
+    if n <= 0:
+        return 0
+    if n in [1,2]:
+        return 1
+    return naive_fibonacci(n-1) + naive_fibonacci(n-2)
+
+
+def cache_fibonacci(n, cache=None):
+    if cache is None:
+        cache = [None for i in range(n+1)]
+        cache[0] = 0
+        cache[1] = cache[2] = 1
+        return cache_fibonacci(n, cache)
+    else:
+        if cache[n] is not None:
+            return cache[n]
+        else:
+            cache[n] = cache_fibonacci(n-1, cache) + cache_fibonacci(n-2, cache)
+            return cache[n]
+
+def non_reccurent_fibonacci(n):
+    cache = [None for i in range(n+1)]
+    cache[0] = 0
+    cache[1] = cache[2] = 1
+    for i in range(2, n + 1):
+        cache[i] = cache[i-1] + cache[i-2]
+    return cache[n]
+
+for i in [5, 10, 15, 20, 30, 40]:
+    print("Naive fibonacci for ", i, ":", naive_fibonacci(i))
+
+for i in [5, 10, 15, 20, 30, 40, 100]:
+    print("cache fibonacci for ", i, ":", cache_fibonacci(i))
+
+for i in [5, 10, 15, 20, 30, 40, 100]:
+    print("no-recurrent fibonacci for ", i, ":", non_reccurent_fibonacci(i))
+
diff --git a/labs04/examples/myip.py b/labs04/examples/myip.py
new file mode 100644
index 0000000..14013ac
--- /dev/null
+++ b/labs04/examples/myip.py
@@ -0,0 +1,11 @@
+#!/usr/bin/env python
+
+"""
+This simple script fetches your IP as seen by web pages, and displays it.
+
+Execute this script locally like that:
+$ curl -s https://raw.github.com/gist/3389407/myip.py | python
+"""
+import requests
+
+print(requests.get('http://ip.42.pl/raw').text)
diff --git a/labs04/examples/wc.py b/labs04/examples/wc.py
new file mode 100644
index 0000000..4dfc78c
--- /dev/null
+++ b/labs04/examples/wc.py
@@ -0,0 +1,39 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Implementacja narzedzia ``wc`` z linuksa (word counter).
+Zwraca liczbę słów, znaków i linii.
+"""
+
+import sys
+
+
+def count_lines(text):
+    """ return number of lines. """
+    return len(text.strip().split('\n'))
+
+def count_words(text):
+    """ return number of words. """
+    return sum([len([1 for word in line.split(' ') if len(word)])
+                for line in text.split('\n')])
+
+def count_chars(text):
+    """ return number of words. """
+    return len(text)
+
+def wc(text):
+    """ proper wc """
+    lines = count_lines(text)
+    words = count_words(text)
+    chars = count_chars(text)
+    return lines, words, chars
+
+
+def main():
+    """ main """
+    print(wc(sys.stdin.read()))
+
+
+if __name__ == "__main__":
+    main()