21.   As you step through the door, a shrill alarm sounds.

22.   Athena, a lanky black poodle, loudly greets her master when Ivins steps through the door.

23.   Bill Gould said he felt like an urban pioneer when he stepped through a kudzu-shrouded doorway nine years ago into his new home.

24.   After you scan a document, the program offers to step you through the process of character recognition.

25.   But as he pulled on an olive-colored shirt, the trainer Gene Monahan stepped through a throng of reporters.

26.   But as they stepped through into the living room, there stood three burly blond men, dress in white.

27.   But by pausing and looking just a little more carefully at the furnishings and pictures on the wall, one can step through that veneer into medieval Albania.

28.   But he never once stepped through a snowdrift.

29.   But when the audience went back to the area in which the first episode took place, the dancers returned with great dignity, stepping through mist.

30.   Each of them warily stepped through the minefields of memory, some choosing to recall, some trying to forget.