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PDFtk (short for PDF Toolkit) is a toolkit for manipulating Portable Document Format (PDF) documents. [ 3 ] [ 4 ] It runs on Linux , Windows and macOS . [ 5 ] It comes in three versions: PDFtk Server ( open-source command-line tool ), PDFtk Free ( freeware ) and PDFtk Pro ( proprietary paid ). [ 2 ]
The book Lan Trì kiến văn lục is one of those and is composed of an introduction, forewords, preface and preamble (written in Literary Chinese by Vũ Trinh's colleagues) and 45 creative pieces (written by Vũ Trinh himself). The book is composed of simple short stories of the end of 18th century beginning of 19th century.
Vietnamese uses 22 letters of the ISO basic Latin alphabet.The 4 remaining letters aren't considered part of the Vietnamese alphabet although they are used to write loanwords, languages of other ethnic groups in the country based on Vietnamese phonetics to differentiate the meanings or even Vietnamese dialects, for example: dz or z for southerner pronunciation of v in standard Vietnamese.