Manufacturers tended to concentrate on one form or the other.
When people are given lots of choices, they tend to concentrate their attention on only a few.
Tourists tend to concentrate here, although there are two similar greens to the east.
Students of language, be they professional or amateur, tend to concentrate on change.
And that sort of thing tends to concentrate the mind wonderfully, doesn't it?
The media tends only to concentrate on what makes good headlines and of course that's the bad stuff.
The science tended to concentrate on the new chemical approaches.
We tend to concentrate on just one thing, but Prophecy includes everything at the same time.
Most people tend to concentrate on the inner surroundings, or close the eyes and try to sleep.
So that's why I would tend to concentrate on what we're doing now.