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5.28.3 Blank Line Traps
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 -- Request: .blm [name]
     Set a blank line trap, calling the macro NAME when GNU 'troff'
     encounters a blank line in an input file, instead of the usual
     behavior (*note Breaking::).  A line consisting only of spaces is
     also treated as blank and subject to this trap.  If no argument is
     supplied, the default blank line behavior is (re-)established.