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while (<DATA>) {
    print if /CR/ .. /NR/;
...
yada yada yada
NR 17
rubbish

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CR *FDA, 1997, GUID IND EXT REL OR
   BADAWY SIF, 1996, INT J PHARM, V128, P45
...
CR yada yada
yada yada yada
NR 17