File list (Check if you may need any files):
Collaborative+Filtering
.......................\Collaborative Filtering
.......................\.......................\.classpath
.......................\.......................\.project
.......................\.......................\bin
.......................\.......................\...\pku
.......................\.......................\...\...\Recommendation.class
.......................\.......................\preference.data
.......................\.......................\src
.......................\.......................\...\pku
.......................\.......................\...\...\Recommendation.java
.......................\.......................\test.data
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