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toan truc » toan thuc, doan truc, toan trac
truc tiep » thuc tien, truc tinh
hoc thong » hoc thuong, hoc trong, hoc hong
pho thong » he thong
tiep cac » tiep can, tiep cau, thien cac
cac khoa » cac khoan, cac khoi, dac khoa
khoa hoc » hoa hoc
sach tri » sach tai, sach tren, sach truc
tu sach » thu sach, su sach, te sach
cac hoc » cach hoc, cac hop, bac hoc
tri tu » tri tue, troi tu, tai tu
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