Might as well use array size directly

1.rb

@@ -17,20 +17,18 @@ def phrases(number)
 
   def double_words(strings)
     all_strings = []
-    num_words = strings.size
 
     # Extracting double-word phrases
-    (0...num_words - 1).each do |i|
+    (0...strings.size - 1).each do |i|
       all_strings << "#{strings[i]} #{strings[i + 1]}"
     end
     return all_strings
   end
 
   def triple_words(strings)
     all_strings = []
-    num_words = strings.size
 
-    (0...num_words - 2).each do |i|
+    (0...strings.size - 2).each do |i|
       all_strings << "#{strings[i]} #{strings[i + 1]} #{strings[i + 2]}"
     end
     return all_strings