In general, our rules tend to give greater weight to national and international sources over regional or local ones.

Both rules tend to stop program trading under such circumstances.

But wherever they congregate, the rules tend to remain constant.

These rules tend to be restricted to a single small style organization or even individual sport event promotions.

In general, the rules leading to higher rates of survival and reproduction tend to increase in the population.

With the advent of written representations, formal rules about language usage tend to appear also.

In practice, though, the rules tend to create problems by muffling the useful signals that prices send.

Once a kind of critical mass is reached, she said, the rules tend to be tightened and choices narrow.

And the rule of thumb tends to be, the more that are ready the better.

Where guests from one college are dining at another's formal hall, the rules followed by the hosts tend to apply.