| 1123 | Salary | Autumn School Contest 2001 | 3781 | 119 |
| 1297 | Palindrome | Spring School Contest 2004 | 5618 | 83 |
| 1354 | Palindrome. Again Palindrome | Spring School Contest 2005 | 3241 | 146 |
| 1635 | Mnemonics and Palindromes | USU Championship 2008 | 1884 | 192 |
| 1714 | Mnemonics and Palindromes 2 | NEERC 2009 Eastern Subregional | 105 | 2874 |
| 1737 | Mnemonics and Palindromes 3 | USU Championship 2009 | 1399 | 233 |
| 1761 | Binary Palindrome | USU Personal Contest 2010 | 302 | 1016 |
| 1954 | Five Palindromes | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 54 | 3433 |
| 1960 | Palindromes and Super Abilities | Petrozavodsk Winter 2013. Kontur Cup. ChU 2013 Selection | 501 | 430 |
| 1989 | Subpalindromes | Ural FU Championship 2013 | 696 | 298 |
| 2037 | Richness of binary words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 175 | 979 |
| 2040 | Palindromes and Super Abilities 2 | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 246 | 707 |
| 2042 | Nikita | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 27 | 4893 |
| 2044 | 31 Palindromes | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 74 | 2155 |
| 2045 | Richness of words | Petrozavodsk Summer 2014. Ural FU Dandelion Contest | 369 | 478 |
