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interface User {
    name: string;
    age?: number;
    birthday?: string;
}

const prettyPrintWilder = (users: User[]):void => {
    users.map((user: User) => {
      console.log(`${user.name} is ${user.age} years old`);

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1 - B
2 - B
3 - B
4 - B
5 - B
6 - A
7 - B
8 - A
9 - C

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1 - A 
2 - A
3 - B
4 - B
5 - B
6 - C
7 - B
8 - A
9 - B

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https://google-gruyere.appspot.com/GRUYEREINSTANCEID/deletesnippet?index=0