Use 6, such as 66, or 666.
1 100 yuan perfect.
1.88, 18.8,188-all the time.
0.66, 6.6, 6.66, 66.6, 66.66-sleek.
0.88, 8.8, 8.88, 88.8, 88.88- hair.
0.99, 9.9, 9.99, 99.9, 99.99-means that your friendship with your friends lasts forever.
20.99, 2 1.88, 29.98, 29.99, 20.09-their friendship is long and lasting.