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+#ifndef DIFFERENCE_H_081276A3
+#define DIFFERENCE_H_081276A3
+
+#include <random>
+#include <string>
+#include <Magick++.h>
+#include <utility>
+#include <verbly.h>
+#include <stdexcept>
+#include <twitter.h>
+#include <memory>
+
+class difference {
+public:
+
+  difference(
+    std::string configFile,
+    std::mt19937& rng);
+
+  void run() const;
+
+private:
+
+  verbly::word getPicturedNoun() const;
+
+  std::pair<Magick::Image, Magick::Image>
+    getImagesForNoun(verbly::word pictured) const;
+
+  Magick::Image getImageAtUrl(std::string url) const;
+
+  std::pair<verbly::word, verbly::word> getOppositeIdentifiers() const;
+
+  Magick::Image composeImage(
+    Magick::Image image1,
+    verbly::word word1,
+    Magick::Image image2,
+    verbly::word word2) const;
+
+  std::string generateTweetText(verbly::word word1, verbly::word word2) const;
+
+  void sendTweet(std::string text, Magick::Image image) const;
+
+  class could_not_get_images : public std::runtime_error {
+  public:
+
+    could_not_get_images() : std::runtime_error("Could not get images for noun")
+    {
+    }
+  };
+
+  std::mt19937& rng_;
+  std::unique_ptr<verbly::database> database_;
+  std::unique_ptr<twitter::client> client_;
+  std::string fontfile_;
+
+};
+
+#endif /* end of include guard: DIFFERENCE_H_081276A3 */