Tuy u1ec3n t u1eadp trai c u1eb7c b u1ef1 th u1ee7 d acirc m P2
Cac 18cm P2
u0110 u1eb9p trai s u1ee5c c u1eb7c to d agrave i tr ecirc n t agrave u bi u1ec3n
trai x acirc y d u1ef1ng qu u1eadn 7suc cu to dai