/usr/share/python-apt/templates/Blankon.mirrors is in python-apt-common 1.1.0~beta1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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http://kambing.ui.ac.id/blankon/
http://mirror.omadata.com/blankon/
http://repo.ugm.ac.id/repo/blankon/
http://buaya.klas.or.id/blankon/
http://bos.fkip.uns.ac.id/blankon
http://pandawa.ipb.ac.id/blankon/
http://dl2.foss-id.web.id/blankon/
http://shol.vlsm.org/blankon/
http://openstorage.gunadarma.ac.id/blankon/
http://debian.rab.co.id/blankon/
http://singo.ub.ac.id/blankon/
http://ftp.paudni.kemdiknas.go.id/blankon/
http://blankon.idrepo.or.id/blankon/
http://mirror.kioss.undip.ac.id/blankon/
http://repo.unnes.ac.id/repo/blankon/
http://kartolo.sby.datautama.net.id/blankon/
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