Enhanced Indonesian Spelling System  The Enhanced Spelling System (, abbreviated EYD), also called the Perfected Spelling System, and later called the Enhanced Indonesian Spelling System (), and since 2015 Indonesian Spelling System (, often referred to as the Indonesian Spelling System General Manual (), PUEBI) is the spelling system used for the Indonesian language. It is an orthography that is released in 1972 to replace the Republican Spelling System ("RSS", also called the Soewandi Spelling System, "SSS"). The aim was greater harmonization of the Indonesian and Malay-language orthographies. The adoption of the new EYD system, to begin on the 27th anniversary of Indonesia's independence on 17 August 1972, was announced by President Suharto on 16 August 1972. Government departments were instructed to begin using the EYD system on 1 January 1973. On 27 August 1975, the Minister of Education and Culture officially issued Minister Decree No. 0196/U/1975 of General Guideline of Enhanced Indonesian Spelling System, which provided a detailed explanation of the changes proposed in the new system and marked the official use of EYD system. On 9 September 1987, the Minister of Education and Culture issued Minister Decree No. 0543a/U/1987 of General Guideline of Enhanced Indonesian Spelling System. This ministerial decree updated the previous spelling system and was used for 22 years until the next update was issued. On 31 July 2009, the Minister of National Education issued Minister Decree No. 46/2009 of General Guideline of Enhanced Indonesian Spelling System, which served as a new update, and the previous update was officially declared invalid. The latest update of the Indonesian spelling system was issued on 26 November 2015 by Minister of Education and Culture decree No 50/2015. It was the first time the term of "Indonesian spelling system" was used; previously it was "Enhanced Indonesian spelling system". There were only minor changes compared to the previous update, including the addition of new diphthong of "ei", whereas previously there were only 3 diphthongs, "ai", "au" and "oi", and new rules on the usage of bold letters. Letters that had previously been included in the Republican Spelling as foreign loan letters are officially used in the EYD Spelling. The letters "q" and "x" are still only used in scientific subjects. Examples:  The writing of "di-" and "ke-" (affixes) can be distinguished from "di" and "ke" (prepositions), where "di-" and "ke-" are written together with the words that follow it, for example "diambil", "kehendak" (is being taken, desire), while "di" and "ke" are written separately with the words that follow it, for example "di rumah", "ke pasar" (at home, to the market).