diff --git a/.DS_Store b/.DS_Store
new file mode 100644
index 0000000..c31647d
Binary files /dev/null and b/.DS_Store differ
diff --git a/lib/array_intersection.rb b/lib/array_intersection.rb
index ac8771f..8052e43 100644
--- a/lib/array_intersection.rb
+++ b/lib/array_intersection.rb
@@ -1,3 +1,18 @@
 def intersection(list1, list2)
-  raise NotImplementedError, "Intersection not implemented"
+  hash = {}
+  intersect = []
+
+  list1.each do |item|
+    hash[item] = true
+  end
+
+  list2.each do |item|
+    if hash[item]
+      intersect << item
+    end
+  end
+
+  return intersect
+
+
 end
\ No newline at end of file
diff --git a/lib/palindrome_permutation.rb b/lib/palindrome_permutation.rb
index f113692..940a7d8 100644
--- a/lib/palindrome_permutation.rb
+++ b/lib/palindrome_permutation.rb
@@ -1,4 +1,24 @@
-
 def palindrome_permutation?(string)
-  raise NotImplementedError, "palindrome_permutation? not implemented"
-end
\ No newline at end of file
+  if string.empty?
+    return true
+  end
+
+  hash = {}
+  array = string.chars
+
+  array.each do |char|
+    if hash[char]
+      hash[char] += 1
+    else
+      hash[char] = 1
+    end
+  end
+
+  odd = 0
+
+  hash.each do |key, value|
+    odd += 1 if value % 2 != 0
+  end
+
+  odd > 1 ? false : true
+end
diff --git a/lib/permutations.rb b/lib/permutations.rb
index 3b08381..1ee927b 100644
--- a/lib/permutations.rb
+++ b/lib/permutations.rb
@@ -1,4 +1,23 @@
 
 def permutations?(string1, string2)
-  raise NotImplementedError, "permutations? not implemented"
+  
+  return true if string1.empty? || string2.empty?
+  return false if string1.length != string2.length
+
+  array1 = string1.chars
+  array2 = string2.chars
+
+  hash = {}
+
+  array1.each do |char|
+    hash[char] = true
+  end
+
+  array2.each do |char|
+    if hash[char] == nil
+      return false
+    end
+  end
+
+  return true
 end
\ No newline at end of file
diff --git a/test/palindrome_permutation_test.rb b/test/palindrome_permutation_test.rb
index e9119de..b966841 100644
--- a/test/palindrome_permutation_test.rb
+++ b/test/palindrome_permutation_test.rb
@@ -1,6 +1,6 @@
 require_relative "test_helper"
 
-xdescribe "palindrome_permutation?" do
+describe "palindrome_permutation?" do
   it "will work for hello" do
     expect(palindrome_permutation?("hello")).must_equal false
   end
@@ -19,5 +19,5 @@
 
   it "will return false for raceca" do
     expect(palindrome_permutation?("raceca")).must_equal false
-  end   
-end
\ No newline at end of file
+  end
+end
diff --git a/test/permutations_test.rb b/test/permutations_test.rb
index 79da2f6..5f6ae77 100644
--- a/test/permutations_test.rb
+++ b/test/permutations_test.rb
@@ -1,6 +1,6 @@
 require_relative "test_helper"
 
-xdescribe "permutations?" do
+describe "permutations?" do
   it "returns true for empty string" do
     expect(permutations?("", "")).must_equal true
   end