groff: Common Features

 
 3.2 Common Features
 ===================
 
 'gtroff' provides very low-level operations for formatting a document.
 There are many common routine operations that are done in all documents.
 These common operations are written into "macros" and collected into a
 "macro package".
 
    All macro packages provide certain common capabilities that fall into
 the following categories.
 

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