/* package whatever; // don't place package name! */
 
import java.util.function.IntFunction;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		String result = IntStream.rangeClosed(1, 15).mapToObj(new IntFunction<String>() {
			@Override
			public String apply(int i) {
				int end = i * (i + 1) / 2;
				return IntStream.rangeClosed(end - i + 1, end).mapToObj(Integer::toString)
						.collect(Collectors.joining(" "));
			}
		}).collect(Collectors.joining("\n"));
		System.out.println(result);
	}
}

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