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##Eskil Plugin : Compare set of words
# Example file for a plugin.
# A plugin must start exactly like this one.
# The text after : is the summary you can get at the command line
# This plugin compares the set of words in files.
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##Eskil Plugin : Compare set of words
#
# This plugin compares the set of words in files.
# Example file for a plugin.
# A plugin's first line must start exactly like this one.
# The text after : is the summary you can get at the command line
# A plugin must define this procedure to do the job.
# side: left or right
# chi: An input channel for reading the original file.
# cho: An output channel for writing the processed file.
proc PreProcess {side chi cho} {
while {[gets $chi line] >= 0} {
foreach word [regexp -all -inline {\w+} $line] {
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