$ composer install

$ ./bin/hello.php

$ make hello

$ ./bin/dump-ex0010.php

$ make dump-ex0010

$ ./bin/dump-ex0020.php

$ make dump-ex0020

$ ./bin/merge-ex0010.php

$ make merge-ex0010

$ ./bin/merge-ex0011.php

$ make merge-ex0011

$ ./bin/merge-ex0020.php

$ make merge-ex0020

$ ./bin/dump-ex0011.php

$ make dump-ex0011

$ ./bin/dump-ex0021.php

$ make dump-ex0021