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diff --git a/src/static_bitsequence/static_bitsequence_sdarray.h b/src/static_bitsequence/static_bitsequence_sdarray.h
new file mode 100644
index 0000000..f8944d4
--- /dev/null
+++ b/src/static_bitsequence/static_bitsequence_sdarray.h
@@ -0,0 +1,30 @@
+
+#ifndef _STATIC_BITSEQUENCE_SDARRAY_H
+#define _STATIC_BITSEQUENCE_SDARRAY_H
+
+#include <basics.h>
+#include <static_bitsequence.h>
+#include <sdarray.h>
+
+class static_bitsequence_sdarray: public static_bitsequence {
+	public:
+		static_bitsequence_sdarray(uint * buff, uint len);
+		virtual ~static_bitsequence_sdarray();
+		virtual uint select1(uint i);
+		virtual uint rank1(uint i);
+		virtual uint select_next1(uint i);
+		virtual uint size();
+		virtual int save(FILE * fp);
+		static static_bitsequence_sdarray * load(FILE * fp);
+
+		uint select_next1_unsafe(uint i){
+			return selects3_selectnext(&sd,i);	
+		};
+	protected:
+		selects3 sd;
+		static_bitsequence_sdarray();
+
+};
+
+#endif
+