the sheer difficulties posed by having two concurrent writing systems hinders communications between mainland china and other regions, although with exposure and experience a person educated in one system can quickly become familiar with the other system. for those who know both systems well, converting an entire document written using simplified characters to traditional characters, or vice versa, is a trivial but laborious task. automated conversion, however, from simplified to traditional is not straightforward because there is not always a one-to-one mapping of a simplified character to a traditional character. one simplified character may equate to many traditional characters. as a result, a computer can be used for the bulk of the conversion but will still need final checking by a human.