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This file is part of Logtalk <http://logtalk.org/>  

Logtalk is free software. You can redistribute it and/or modify it under
the terms of the FSF GNU General Public License 3  (plus some additional
terms per section 7).        Consult the `LICENSE.txt` file for details.
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% start by loading the loading the example:

| ?- logtalk_load(barriers(loader)).
...


% run example:

| ?- beatles::sing_along.

hello(1)hello(4)hello(2)hello(3)
Enough of hellos! Time for goodbyes!
goodbye(2)goodbye(1)goodbye(3)goodbye(4)

Yes
