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9 nine
first
second
third
fourth
fifth
sixth
seventh
eighth
ninth
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
2a. What rules can you find from ordinal numbers ？
2a. What rules can you find from ordinal numbers ？
10 ten
11 eleven
12 twelve
13 thirteen
14 fourteen
15 fifteen
16 sixteen
17 seventeen
18 eighteen