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diff --git a/research/deorummolae.h b/research/deorummolae.h
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+++ b/research/deorummolae.h
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+#ifndef BROTLI_RESEARCH_DEORUMMOLAE_H_
+#define BROTLI_RESEARCH_DEORUMMOLAE_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+/* log2(maximal number of files). Value 6 provides some speedups. */
+#define LOG_MAX_FILES 6
+
+/* Non tunable definitions. */
+#define MAX_FILES (1 << LOG_MAX_FILES)
+
+/**
+ * Generate a dictionary for given samples.
+ *
+ * @param dictionary storage for generated dictionary
+ * @param dictionary_size_limit maximal dictionary size
+ * @param num_samples number of samples
+ * @param sample_sizes array with sample sizes
+ * @param sample_data concatenated samples
+ * @return generated dictionary size
+ */
+size_t DM_generate(uint8_t* dictionary, size_t dictionary_size_limit,
+    size_t num_samples, const size_t* sample_sizes,
+    const uint8_t* sample_data);
+
+#endif  // BROTLI_RESEARCH_DEORUMMOLAE_H_