Armenian can be divided into two major dialectal blocks and those blocks into individual dialects, though many of the Western Armenian dialects have become extinct due to the effects of the Armenian Genocide. In addition, neither dialect is completely homogeneous: any dialect can be subdivided into several subdialects. Although Western and Eastern Armenian are often described as different dialects of the same language, many subdialects are not readily mutually intelligible. Nevertheless, a fluent speaker of one of two greatly varying dialects who is also literate in one of the standards, when exposed to the other dialect for a period of time will be able to understand the other with relative ease.