Only the outer ones are known and they've already been scoured through.

The two middle express tracks run at a lower level than the two outer local ones.

This allows the seeds in the outer ones to be shot to a greater distance than those within.

At right are three figures; the two outer ones perhaps hold fast the one in the middle.

But Lesson 2 is that what goes on in the inner rings can be completely sealed from the outer ones.

The artists offer evidence of complex inner lives, even when the outer ones are impaired.

The hindfeet are long and have the three central digits longer than the two outer ones.

Trains using these tracks open their doors to the center island platforms, not the outer ones.

The inner doors would not open unless the outer ones were locked tight.

Carlos said, "There is a difference between the inner doors and the outer ones.