No sooner has a [synthetic] drug been blacklisted than chemists adjust their recipe and start churning out a subtly different one. These “legal highs” are sold for the few months it takes the authorities to identify and ban them, and then the cycle begins again.

In order to constructivize a mathematical notion we consider its classical definition written in terms of the arithmetic of natural numbers. Then we relativize the existential quantifiers according to the following well known scheme.

His old rubber boots wuz all wore offen him, his clothes hangin' in rags and tatters where he had rushed through the woods and swamps, his feet and hands all froze.

According to the Law of Demeter, the second approach is better because the summary screen sends a message only to an object that is returned by one of its methods […]