And they knew about "the world's most perfect defensive system."

Some spend thousands of dollars in their quest for the perfect system.

There is no perfect system, but some systems are less dysfunctional than others.

I don't think there will ever be a perfect system.

We can all sit down and design a perfect system on paper, but it isn't going to be reality.

They help illustrate that there's no perfect system out there.

A perfect system would eliminate the need for a trusted third party.

"It's a perfect system for what I like to do."

"You're never going to have a perfect system," she said.

It's not a perfect system, but it works most of the time.