diff --git a/example_code/item_04.py b/example_code/item_04.py
index 5afff3f..579d3a4 100755
--- a/example_code/item_04.py
+++ b/example_code/item_04.py
@@ -42,6 +42,10 @@
 print('Green:   %r' % green)
 print('Opacity: %r' % opacity)
 
+#@pyl
+# what if there are two identical keys?
+my_values_2 = parse_qs('red=5&blue=0&green=&red=13', keep_blank_values = True)
+red_2 = my_values_2.get('red')  # red_2 = ['5', '13']
 
 # Example 4
 red = int(my_values.get('red', [''])[0] or 0)
diff --git a/example_code/item_08.py b/example_code/item_08.py
index 1b5f810..ee35d4a 100755
--- a/example_code/item_08.py
+++ b/example_code/item_08.py
@@ -22,8 +22,10 @@
 
 # Example 1
 matrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
-flat = [x for row in matrix for x in row]
-print(flat)
+flat_1 = [x for row in matrix for x in row]
+# flat_2 = [x for x in row for row in matrix ] # NameError: name 'row' is not defined
+print(flat_1)
+# print(flat_2)
 
 
 # Example 2
diff --git a/example_code/item_09.py b/example_code/item_09.py
index 6d3a41a..dc09b53 100755
--- a/example_code/item_09.py
+++ b/example_code/item_09.py
@@ -47,3 +47,7 @@
 
 # Example 5
 print(next(roots))
+
+#@pyl
+roots_alt = {x:x**0.5 for x in it}
+print(roots_alt)
\ No newline at end of file
diff --git a/example_code/item_10.py b/example_code/item_10.py
index fb244be..9f40bfd 100755
--- a/example_code/item_10.py
+++ b/example_code/item_10.py
@@ -24,8 +24,10 @@
 from random import randint
 random_bits = 0
 for i in range(64):
+    print('i: %d' % i)
     if randint(0, 1):
         random_bits |= 1 << i
+        print(random_bits)
 print(bin(random_bits))
 
 
diff --git a/example_code/item_11.py b/example_code/item_11.py
index 09cffa5..417c392 100755
--- a/example_code/item_11.py
+++ b/example_code/item_11.py
@@ -61,6 +61,7 @@
 
 
 # Example 5
+# @pyl: names and letters have different length
 names.append('Rosalind')
 for name, count in zip(names, letters):
-    print(name)
+    print('%s: %d' % (name, count))