context: Great Indonesia or Great Malay is a political concept that aims to unite the separate race of the Malays within the territory of the British colonies on the Malay Peninsula and North Borneo (the area that now forms the states of Malaysia, Singapore and Brunei), with the Dutch East Indies (now Indonesia), and the Portuguese colony in Timor Leste became a large and sovereign nation. [1] Great Malay was put forward by students and alumni of Sultan Idris University of Education, British Malaya, in the 1920s, and then the same idea called Greater Indonesia was put forward by Indonesian political figures from Sumatra and Java, such as Muhammad Yamin and Sukarno in the 1950s. [1]
question: When was the concept of Raya Raya formed?
answers.text: 1920s