What's the difference between perambulate and preambulate?

Perambulate

Definition:

(v. t.) To walk through or over; especially, to travel over for the purpose of surveying or examining; to inspect by traversing; specifically, to inspect officially the boundaries of, as of a town or parish, by walking over the whole line.
(v. i.) To walk about; to ramble; to stroll; as, he perambulated in the park.

Example Sentences:

(1) I seem to see Madonna Grimes drifting vacantly from job to job, a perambulating pain in the neck wherever she works.
(2) A brief account is given of a person, small in stature, with retarded development, who, following the breakdown of marital intimacy and the failure of his efforts to adopt a child, found sexual satisfaction by defecating in unoccupied perambulators and subsequently inflicting damage on them.
(3) The Steinway's perambulations are a symbol of that cumbrous, precious heritage of images and ideas that the refugees from Hitler carried into exile.
(4) Taking our afternoon perambulations, Sir Henry and I encountered the local naturalist John Stapleton out on the moor with his sister.
(5) Dancers will negotiate the slippery limestone rocks, disappearing into underground passageways and then popping up later in front of the perambulating audience; a choir's singing will rise as if from the centre of the earth.
(6) The abdominal symptoms develop latently and surgery prevalently ensues during the stage of intestinal wall necrosis or perambulating peritonitis.