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(groff)Line Continuation

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Line Continuation
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   There is a continuation convention which permits the argument to the
`x X' command to contain newlines: When outputting the argument to the
`x X' command, GNU `troff' follows each newline in the argument with a
`+' character (as usual, it terminates the entire argument with a
newline); thus if the line after the line containing the `x X' command
starts with `+', then the newline ending the line containing the `x X'
command should be treated as part of the argument to the `x X' command,
the `+' should be ignored, and the part of the line following the `+'
should be treated like the part of the line following the `x X' command.