"concrete rule" is a legitimate phrase in written English and can be used in any context where a particular rule needs to be emphasized.
For example, "The concrete rule was that no one was allowed to be late to the meeting."
The British interrogators were as hard as nails, and uncompromising in their determination to extract the truth, but they established a concrete rule that no spy should ever be subjected to physical coercion.
Pete Brown, writing in his Morning Advertiser column, asks: 'Camra have won their battle, so what's next?' Since Camra's inception, its most concrete rule was to fight for good quality beer.
But the reason why I came up with a concrete rule in the first place is because the compulsion to peek at my e-mail is so strong.This all suggests that we cannot trust ourselves; and that it is not the office that demands we are on call, but our own weakness.
But despite the public outcry for these things, no concrete rule has been put in place in these areas.
There's only one concrete rule of the competition: each entry must include at least one system sound effect from either the iPhone or the Droid.
This because even when the minimum number of lines is tried to be utilized, several solutions could take place (there is not a concrete rule to follow for crossing the zeros).
New Zealand has already drawn up concrete rules (see article).
Concrete rules sometimes translate into simple yes-or-no criteria.
Concrete rules for sample size updating are provided.
Unlike languages, which have concrete rules, gender is often defined as much by what it isn't as what it is, and learned by doing.
Although design principles are known by software developers, it is difficult to apply them in practice without concrete rules to follow.
