/etc/X11/imwheel/imwheel rc starts out with:

# This is only for demonstration of the priority command…
# See the other global Exclude command below for the one you want to use!
# If this is activated it will only apps that have a lower priority
# priority is based first on the priority command, then the position in this
# file – the higher the line is in a file the higher in a priority class it is
# thus for a default priority you can see that the position in the file is
# important, but the priority command CAN appear anywahere in a window’s list
# of translations, and the priority will be assigned to all translations below
# it until either a new window is defined or the priority is set again.

I can’t make heads or tails of that. It’s like most of the sentence-ending periods have been misplaced to make random, unnecessary ellipses elsewhere in the file.