/usr/share/doc/t-code-common/skkinput3/tcinput is in t-code-common 2:2.3.1-3.5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | #!/bin/sh
prefix=/usr
exec skkinput -config ${datarootdir}/t-code "$@"
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