diff --git a/cookbook/007/intro.rb b/cookbook/007/intro.rb
new file mode 100644
index 0000000..6e32b06
--- /dev/null
+++ b/cookbook/007/intro.rb
@@ -0,0 +1,15 @@
+[1, 2, 3].each { |i| puts i }
+
+[1, 2, 3].each do |i|
+  if i % 2 == 0
+    puts "#{i} is even."
+  else
+    puts "#{i} is odd."
+  end
+end
+
+1.upto 3 do |x|
+  puts x
+end
+
+1.upto(3) { |x| puts x }