sentences:  Certain high values were later printed by the Pacheng Printing Co. of Nanping in Fujian Province; these were first released in 1942.This issue continued in use through most of the tumult of the following decade.The resulting varieties in printing methods, design details, secret marks, watermarks and perforations, as well as overprints for regional, occupation and revalued uses make the study of this issue the most complex of the Sun Yat-sen issues.