diff --git a/lib/diff.rb b/lib/diff.rb
index 59510bed..14fa0511 100644
--- a/lib/diff.rb
+++ b/lib/diff.rb
@@ -1,3 +1,4 @@
+require_relative "./diff/combined"
 require_relative "./diff/hunk"
 require_relative "./diff/myers"
 
@@ -29,4 +30,9 @@ def self.diff(a, b)
   def self.diff_hunks(a, b)
     Hunk.filter(diff(a, b))
   end
+
+  def self.combined(as, b)
+    diffs = as.map { |a| diff(a, b) }
+    Combined.new(diffs).to_a
+  end
 end
diff --git a/lib/diff/combined.rb b/lib/diff/combined.rb
new file mode 100644
index 00000000..d6f6b7ae
--- /dev/null
+++ b/lib/diff/combined.rb
@@ -0,0 +1,59 @@
+module Diff
+  class Combined
+
+    include Enumerable
+
+    Row = Struct.new(:edits) do
+      def to_s
+        symbols = edits.map { |edit| SYMBOLS.fetch(edit&.type, " ") }
+
+        del  = edits.find { |edit| edit&.type == :del }
+        line = del ? del.a_line : edits.first.b_line
+
+        symbols.join("") + line.text
+      end
+    end
+
+    def initialize(diffs)
+      @diffs = diffs
+    end
+
+    def each
+      @offsets = @diffs.map { 0 }
+
+      loop do
+        @diffs.each_with_index do |diff, i|
+          consume_deletions(diff, i) { |row| yield row }
+        end
+
+        return if complete?
+
+        edits = offset_diffs.map { |offset, diff| diff[offset] }
+        @offsets.map! { |offset| offset + 1 }
+
+        yield Row.new(edits)
+      end
+    end
+
+    private
+
+    def complete?
+      offset_diffs.all? { |offset, diff| offset == diff.size }
+    end
+
+    def offset_diffs
+      @offsets.zip(@diffs)
+    end
+
+    def consume_deletions(diff, i)
+      while @offsets[i] < diff.size and diff[@offsets[i]].type == :del
+        edits = Array.new(@diffs.size)
+        edits[i] = diff[@offsets[i]]
+        @offsets[i] += 1
+
+        yield Row.new(edits)
+      end
+    end
+
+  end
+end