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deb http://archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse
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deb http://archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse
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deb http://archive.ubuntu.com/ubuntu/ xenial-proposed main restricted universe multiverse
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deb http://security.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse
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deb-src http://archive.ubuntu.com/ubuntu/ xenial main restricted universe multiverse
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deb-src http://archive.ubuntu.com/ubuntu/ xenial-updates main restricted universe multiverse
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deb-src http://archive.ubuntu.com/ubuntu/ xenial-proposed main restricted universe multiverse
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deb-src http://security.ubuntu.com/ubuntu/ xenial-security main restricted universe multiverse
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deb http://ddebs.ubuntu.com xenial main restricted universe multiverse
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deb http://ddebs.ubuntu.com xenial-updates main restricted universe multiverse
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deb http://ddebs.ubuntu.com xenial-proposed main restricted universe multiverse