technique is to narrate a historical event or to describe a mathematical problem, pausing at key junctures to allow the students to call out responses that "fill in the blanks". By not identifying individual problems of students and retaining an emotionally distanced demeanor, teachers are said to show themselves to be patient, which is considered admirable. Children ages 6–12 attend primary school, called Sekolah Dasar (SD). As of 2014, most elementary schools are government-operated public schools, accounting for 90.29% of all elementary schools in Indonesia. Students spend six years in primary school, though some schools offer an accelerated learning program in which students who perform well can complete the level in five years. Three years of junior high school (Sekolah Menengah Pertama, or SMP) follows elementary school. Some schools offer an accelerated learning program in which students who perform well can complete the level in two years. There are academic and vocational junior high schools that lead to senior-level diplomas. There are also "domestic science" junior high schools for girls. After completion, they may be attend three years of high school (Sekolah Menengah Atas or SMA). Some high schools offer an accelerated learning program so students who perform well can complete their level in two years. Besides high school, students can choose among 47 programmes of vocational and pre-professional high school (Sekolah Menengah Kejuruan or SMK), divided in the following fields: technology and engineering, health, arts, craft and tourism, information and communication technologies, agro-business and agro-technology, business management. Each requires three years of study. At the senior high school level, three-year agricultural, veterinary, and forestry schools are open to students who have graduated from an academic junior high school. Special schools at the junior and senior levels teach hotel management, legal clerking, plastic arts, and music. Students with disabilities/special needs may opt to be enrolled in a separate school from the mainstream called Sekolah Luar Biasa (SLB, lit. Extraordinary School). The Indonesian education system is the fourth largest in the world with more than 50 million students, 3 million teachers, 300,000 schools. Primary to high school level is compulsory. Primary and middle school is free, while in high school, there are small fees. The completion rate for Indonesian primary schools is high. In 2018, the net enrollment rate for primary, middle school, and high school each is 93.5%, 78.84%, and 60.67%. The tertiary-education participation is low at 36.31%. In 2011,