How to use "central" in a sentence

Plainly, the central idea of secession is the essence of anarchy

In the locked center drawer of the desk was a book with the code numbers that permitted access to the sensitive information stored not on diskette but only in the central memory

They seemed in no hurry, and did not go beyond the central part of London all that day

My brother heard that about half the members of the government had met in Birmingham, in central England, and that enormous amounts of explosive were being prepared to be used in the Midlands