1. ctrl-o open source text file 2. ctrl-h open 'replace' dialog * set 'replace unit' to 'Line' * set unit number filter to: * set 'replace with pattern' to: 3. click 'replace', done. Note: 3<3> means 3, 6, 9, 12, ... !3<3> means 1,2, 4,5, 7,8, 10,11, ...
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