Four questions about <a clean well-lighted place >by Hemingwany

Four questions about <a clean well-lighted place >by Hemingwany
1.THE function of "A girl and a soldier"?
2.WHY did not the writer give them any names?
3.WHY did the waiter repeat the word nada(nothing) so many times?
4.What attitude on old man and life does each of the two waiters have?WHAT'S the writer's attitude tomards
the old man?

谢谢了！

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