why would using "sftp" require disabling "vsftpd"?

[Marko Vojinovic]

On Fri, 07 Feb 2014 01:14:05 +0100
poma <pomidorabelisima at gmail.com> wrote:
> 
> Secure File Transfer Protocol
> /etc/ssh/sshd_config
> Subsystem	sftp	/usr/libexec/openssh/sftp-server
> 
> man 5 sshd_config
> man 8 sftp-server
> man 1 sftp
> 
> 5+8+1=13!

Sorry, I failed to understand what you meant with this last bit about
sum to 13. Care to elaborate, please?

Best, :-)
Marko