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  1. or download this
    <ref id="ref1">
    <ref id="ref2">
    <ref id="ref3">
    ...
    <ref id="ref7">
    <ref id="ref8">
    </end>
    
  2. or download this
    New Group: ref1 ref2 ref3
    New Group: ref4 ref5
    New Group: ref6 ref7 ref8
    
  3. or download this
    open(IN, '<', "test.in") || die "\nCan't open test.in\n $!\n";
    while(<IN>) {
    ...
            }
    }
    close(IN);