Please advise how to fix following problem?
$ sudo apt update
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All packages are up to date.
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list.d/base.list:1
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list.d/base.list:1
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:3 and /etc/apt/sources.list.d/base.list:1
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#deb cdrom:[Official Debian GNU/Linux Live 9.1.0 gnome 2017-07-23T01:42]/ stretch main
deb http://deb.debian.org/debian/ stretch main
deb-src http://deb.debian.org/debian/ stretch main
deb http://security.debian.org/debian-security stretch/updates main
deb-src http://security.debian.org/debian-security stretch/updates main
# stretch-updates, previously known as 'volatile'
deb http://deb.debian.org/debian/ stretch-updates main
deb-src http://deb.debian.org/debian/ stretch-updates main
Regards
satimis