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lang-c
kos's (now deleted) solution as if there are duplicate lines in the input file and some of them fall outside the range and others are inside that range this will delete them all. Also, with multiple occurrences of pattern, if there are lines like--in the input file (outside the ranges) this will delete them because the delimiter--appears ingrep's output when more then one line is matching pattern (the latter is highly unlikely but worth mentioning I guess).