1. Algorithmic Biology Laboratory, St. Petersburg Academic University, Russian Academy of Sciences, St. Petersburg, Russia.
2. These authors contributed equally to this work.
3. Steklov Institute of Mathematics, St. Petersburg, Russia.
4. Department of Computer Science and Engineering, University of California, San Diego, La Jolla, California.
5. Department of Mathematics, University of California, San Diego, La Jolla, California.
6. Department of Computer Science and Engineering, University of South Carolina, Columbia, South Carolina.