You can do this with Perl or simply with "awk."
There are two parts to this problem. The first is recognizing each type of input-line and grabbing the piece that you want from each, storing it in memory. The second is recognizing when the line that you now have (don't forget end-of-file) means that you now have enough information to generate an output-line. "Awk" was built expressly for this, and "perl," long long ago, derived from "awk."
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