Write java code which prints every number from 1 to 20 a number of times equal to the number itself (e.g. one 1, two 2's...). Every individual number printed should be separated by a space, and there should be a new line each time the number changes. You should use nested loops to produce your output (it will result in far less code).

Partial sample run:

1 2 2 3 3 3 ........