Travel or Not?

[just another ref]

It's like trying to keep cattle in the pasture.

"I checked the north fence and it's secure."

What about the south fence?

I checked the north fence from one end to the other. I tightened the wire in a couple of places. It's good now."

What about the east fence?

"I sat there for a while and watched and nothing got out of the north fence."

Half the cows are out. A tree fell on the west fence.

"The north fence is strong. Why is that so hard to understand."