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giai khoa » giao khoa, ngoai khoa, giai thoai
phu thong » phap thong, khau thong, phan thong
pho thong » he thong
tac giai » tac gia, cac giai, tap giai
bai tac » bai tap, bai toan, bai tang
su cac » tu cac, su cao, su can
giai khoa » giao khoa, ngoai khoa, giai thoai
phu thong » phap thong, khau thong, phan thong
pho thong » he thong
tac giai » tac gia, cac giai, tap giai
bai tac » bai tap, bai toan, bai tang
su cac » tu cac, su cao, su can
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