prerm is in scim-chewing 0.3.3-2ubuntu2.
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_TW /etc/X11/xinit/xinput.d/scim-chewing
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