I'm not quite sure what you are trying to do - which tends to mean that nor are you.
You might want to rephrase the problem into pseudo code, something like this:
#for each line {
# split line into bits;
# has string been seen {
# do something;
# }
#}
If you get this bit right then you can turn the pseudo code into real code fairly easily. It will also hep you keep track of what you are doing. I recall being a beginner and how easy it was getting lost in even a short bit of code. This technique I found very helpful.
If you are still stuck then post back the pseudo-code and someone will probably help you fill it. However without the pseudo code it is difficult to know exactly what you want to achieve...
--tidiness is the memory loss of environmental mnemonics
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