According to a SIL report, sign pagsasao of Russia, Moldova and Ukraine share a high degree of lexical similarity and may be dialects of one pagsasao, or distinct related pagsasao. The same report suggested a ""cluster"" of sign pagsasao centered around Czech Sign Pagsasao, Hungarian Sign Pagsasao and Slovakian Sign Pagsasao. This group may also include Romanian, Bulgarian, and Polish sign pagsasao.