 Complete the following phrase:  Many of the early chronicles did not survive for a number of reasons. First, the earliest manuscripts prior to the 15th century were rare and extremely costly. A 1273 Pagan manuscript of Tripiṭaka cost 3000 kyats of silver, which could buy over 2000 hectares of paddy fields. The cost of producing manuscripts creating as well as recopying did come down in the Ava period as literacy rates improved, and the Burmese literature grew more voluminous and diverse. Even then, most did not survive warfare, the main factor in destruction of historical records in Burmese history. Burmese history is littered with instances of conquering forces destroying the conquereds records: Pagan records in 1287 during the 