#!/bin/bash

mkdir -p source/dir1/dir2
  # mkdir -p source/dir1/dir21/dir21-deep
mkdir -p source/dir3
  # mkdir -p source/dir40
  # mkdir -p source/dir41
touch source/file1.txt
touch source/file2.txt
touch source/dir1/dir2/file3.txt
touch source/dir1/file5.txt
touch source/dir3/file4.txt
  # touch source/dir1/dir21/file-21
  # touch source/dir1/dir21/dir21-deep/file21-deep1
  # touch source/dir1/dir21/dir21-deep/file21-deep2