This was done to prevent a writer from adding impossible complications with no reasonable solution in mind.

The companies complain that a lack of city support prevents them from adding more buses.

"Thank you," I said somewhat curtly, hoping to prevent her from adding to my discomfort.

Preventing developers from adding features is not as easy as it sounds.

What is to prevent another developer from adding 22 feet to his building and offering to build two dance studios?

If it gets here, he prevented himself from adding.

Professionalism coupled with hope prevented him from adding, If she wakes up.

But he could not prevent himself from adding: "You really ought to study the Party history a bit."

On the floor today, he forced a vote that would increase spending for security and prevent members from adding unnecessary items to the agency.

But dividing up the color spectrum prevented them from adding more disciplines later.