It seems complicated and long at first but once you get it, it is done easily. For instance, try to explain "how to walk" to someone who had an accident and for

It seems complicated and long at first but once you get it, it is done easily. For instance, try to explain "how to walk" to someone who had an accident and forgot it. Even thought we know exactly how to walk and start doing it takes less than a second, it takes days to explain/master.