// list of car license plates, numbers are always standard of one type // need to output each number separately to the console // then create a map of number to its digits (example A123BC:123) where key is A123BC and value is 123 //var autoNumbers = List.of(List.of("A123BC", "B421FT"), // List.of("O543EC","B421FT", "I222OA"))

java import java.util.; import java.util.stream.;

public class AutoNumbersExample { public static void main(String[] args) { var autoNumbers = List.of( List.of("A123BC", "B421FT"), List.of("O543EC", "B421FT", "I222OA") );

    // Print each number separately
    autoNumbers.stream()
        .flatMap(Collection::stream)
        .forEach(System.out::println);

    // Create a map from number to digits
    Map<String, String> numberToDigits = autoNumbers.stream()
        .flatMap(Collection::stream)
        .distinct() // if unique numbers are needed
        .collect(Collectors.toMap(
            number -> number,
            number -> number.replaceAll("[^0-9]", "")
        ));

    System.out.println(numberToDigits);
}

}

Here we use `flatMap` to transform a list of lists into a stream of strings, print them, and then collect into a map where the key is the number and the value is only the digits from the number.