index_O

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online resources, web sites
opening files
operators
     regular expressions
         alternation functions
         context
         functions
         grouping functions
Options menu
     customization and
     Customize Emacs option
     Dired and
     Save Options option
     Show/Hide option
Outline minor mode
Outline mode 2nd 3rd
     commands
     demoting sections
     marking sections
     promoting sections
     starting
output groups
overwrite mode 2nd