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javascript - Firebase: getting value of a child without knowing its key

How can I get the value of a child element without knowing the key of that child element? Example data structure below;

->cars
-->3282jasjd893j: doors
-->819idid82jkdf: windows
-->fjf842jr8448r: audi

I need to get the values "doors", "windows", "audi", without knowing the keys.

Any advice will be greatly appreciated!

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