It was therefore a simple deduction that the best form of security would be to prevent all access to, or egress from, the place.

No - it's just a matter of simple deduction.

I cannot claim such expertise, Sarek, merely a simple deduction.

But it seems to me that anyone who refuses to make simple empirical deductions ought to have his head examined.

You're sure finding your way to the planet wasn't simple deduction?

A simple deduction, even for one as old as I am.

For now, the Iraqis' job is mostly one of simple deduction.

"Oh, that was simple deduction," Gherkin said with a shrug.

He had done this by a simple deduction, based on the room's position in the house.

As to why you, it is simple deduction.