I have a problem when getting apt update
It says I have duplicate source list
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W: Duplicate sources.list entry http://ftp.us.debian.org/debian/ unstable/main amd64 Packages (/var/lib/apt/lists/ftp.us.debian.org_debian_dists_unstable_main_binary-amd64_Packages)
W: Duplicate sources.list entry http://ftp.us.debian.org/debian/ unstable/contrib amd64 Packages (/var/lib/apt/lists/ftp.us.debian.org_debian_dists_unstable_contrib_binary-amd64_Packages)
W: Duplicate sources.list entry http://ftp.us.debian.org/debian/ unstable/non-free amd64 Packages (/var/lib/apt/lists/ftp.us.debian.org_debian_dists_unstable_non-free_binary-amd64_Packages)
W: You may want to run apt-get update to correct these problems
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deb http://security.debian.org/ jessie/updates main
deb-src http://security.debian.org/ jessie/updates main
deb http://ftp.debian.org/debian/ jessie-updates main
deb-src http://ftp.debian.org/debian/ jessie-updates main
deb http://ftp.debian.org/debian/ jessie main
deb-src http://ftp.debian.org/debian/ jessie main