Segue abaixo a lista de números ordinais em inglês. Observe as partes em negrito para entender a lógica
1st first
2nd second
3rd third
4th fourth
5th fifth
6th sixth
7th seventh
8th eighth
9th ninth
10th tenth
11th eleventh
12th twelfth
13th thirteenth
14th fourteenth
15th fifteenth
16th sixteenth
17th seventeenth
18th eighteenth
19th nineteenth
20th twentieth
21st twenty-first
30th thirtieth
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