There is an extended body of texts associated with Buddhist Tantra, including the "tantras" themselves, tantric commentaries and "shastras", "sadhanas" (liturgical texts), ritual manuals (Jp. "gikirui," 儀軌類), dharanis, poems or songs ("dohas"), termas and so on. According to Harunaga Isaacson,Though we do not know precisely at present just how many Indian tantric Buddhist texts survive today in the language in which they were written, their number is certainly over one thousand five hundred; I suspect indeed over two thousand. A large part of this body of texts has also been translated into Tibetan, and a smaller part into Chinese. Aside from these, there are perhaps another two thousand or more works that are known today only from such translations. We can be certain as well that many others are lost to us forever, in whatever form. Of the texts that survive a very small proportion has been published; an almost insignificant percentage has been edited or translated reliably.Vajrayāna texts exhibit a wide range of literary characteristics—usually a mix of verse and prose, almost always in a Sanskrit that "transgresses frequently against classical norms of grammar and usage," although also occasionally in various Middle Indic dialects or elegant classical Sanskrit.