nine year compulsory education system
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nine year compulsory education system, nine year compulsory education china, china 9 year compulsory education, compulsory education in us, the length of compulsory education, duration of compulsory education, how many years compulsory education in us, compulsory education in usa, age of compulsory education, students in compulsory education, compulsory education by state, compulsory education in america, education in many countries is compulsory, when was education made compulsory