Untitled

16
bai 1: https://pastecode.io/s/k2tynrb3
bai 2: https://pastecode.io/s/r52xcam2
15
bai 1: https://pastecode.io/s/dnx1xdk1
bai 2: https://pastecode.io/s/dbtftqoq
17
bai 1: https://pastecode.io/s/ojmrpost
bai 2: https://pastecode.io/s/z1nqomp9
bai 3: https://pastecode.io/s/i7nexdwf
bai 4: https://pastecode.io/s/ed0qpj5q