Extract lines that appear twice

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# 1  
Old 03-10-2014
Extract lines that appear twice

I have a text file that looks like this :


How could I code this to extract just the subjects that appear twice? I originally thought each subject would appear twice, so I just wanted to use the awk 'NR % 2 == 0' command, but that is no longer the case and now I don't know where to start. Help is much appreciated!
# 2  
Old 03-10-2014
Which field is subject?
# 3  
Old 03-10-2014
The 000* series.
# 4  
Old 03-10-2014
awk -F'/' ' ++arr[$4] == 2 { print $4 } ' file

# 5  
Old 03-10-2014
I tried and it didn't seem to work... It just says Unmatched ' ?
# 6  
Old 03-10-2014
You might have missed a quote

$ awk -F'/' ' ++arr[$4] == 2 { print $4 } ' file

# 7  
Old 03-10-2014
Ok I realized I forgot to type an extra ' after F (dumb), but now it returns just usr1 printed once?
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