prerm is in scim-pinyin 0.5.91-2ubuntu3.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 | #!/bin/sh
set -e
update-alternatives --remove xinput-zh_CN /etc/X11/xinit/xinput.d/scim-pinyin
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