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khan thong » khap thong, khau thong, nhan thong
khoa khan » kho khan, khoa kham, khoa than
cach khoa » bach khoa, cac khoa, cac khoan
hoc thong » hoc thuong, hoc trong, hoc hong
sach tri » sach tai, sach tren, sach truc
thuc san » thuc dan, thuy san, thu san
san khoa » toan khoa, hang khoa, da khoa
thu sach » tu sach, thuat sach, thuoc sach
tue cach » tu cach, thuc cach, ve cach
khoa hoc » hoa hoc
te sach » toc sach
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