+is equivalent to
+.Sq \&.I foo .
+If next-line macros are invoked consecutively, only the last is used.
+If a next-line macro is followed by a non-next-line macro, an error is
+raised, except for
+.Sx \&br ,
+.Sx \&sp ,
+and
+.Sx \&na .
+.Pp
+The syntax is as follows:
+.Bd -literal -offset indent
+\&.YO \(lBbody...\(rB
+\(lBbody...\(rB
+.Ed
+.Pp
+.Bl -column -compact -offset indent "MacroX" "ArgumentsX" "ScopeXXXXX" "CompatX"
+.It Em Macro Ta Em Arguments Ta Em Scope Ta Em Notes
+.It Sx \&AT Ta <=1 Ta current Ta \&
+.It Sx \&B Ta n Ta next-line Ta \&
+.It Sx \&BI Ta n Ta current Ta \&
+.It Sx \&BR Ta n Ta current Ta \&
+.It Sx \&DT Ta 0 Ta current Ta \&
+.It Sx \&I Ta n Ta next-line Ta \&
+.It Sx \&IB Ta n Ta current Ta \&
+.It Sx \&IR Ta n Ta current Ta \&
+.It Sx \&R Ta n Ta next-line Ta \&
+.It Sx \&RB Ta n Ta current Ta \&
+.It Sx \&RI Ta n Ta current Ta \&
+.It Sx \&SB Ta n Ta next-line Ta \&
+.It Sx \&SM Ta n Ta next-line Ta \&
+.It Sx \&TH Ta >1, <6 Ta current Ta \&
+.It Sx \&UC Ta <=1 Ta current Ta \&
+.It Sx \&br Ta 0 Ta current Ta compat
+.It Sx \&fi Ta 0 Ta current Ta compat
+.It Sx \&ft Ta 1 Ta current Ta compat
+.It Sx \&in Ta 1 Ta current Ta compat
+.It Sx \&na Ta 0 Ta current Ta compat
+.It Sx \&nf Ta 0 Ta current Ta compat
+.It Sx \&sp Ta 1 Ta current Ta compat
+.El
+.Pp
+Macros marked as
+.Qq compat
+are included for compatibility with the significant corpus of existing
+manuals that mix dialects of roff.
+These macros should not be used for portable
+.Nm
+manuals.
+.Ss Block Macros
+Block macros comprise a head and body.
+As with in-line macros, the head is scoped to the current line and, in
+one circumstance, the next line (the next-line stipulations as in
+.Sx Line Macros
+apply here as well).
+.Pp
+The syntax is as follows:
+.Bd -literal -offset indent
+\&.YO \(lBhead...\(rB
+\(lBhead...\(rB
+\(lBbody...\(rB
+.Ed
+.Pp
+The closure of body scope may be to the section, where a macro is closed
+by
+.Sx \&SH ;
+sub-section, closed by a section or
+.Sx \&SS ;
+part, closed by a section, sub-section, or
+.Sx \&RE ;
+or paragraph, closed by a section, sub-section, part,
+.Sx \&HP ,
+.Sx \&IP ,
+.Sx \&LP ,
+.Sx \&P ,
+.Sx \&PP ,
+or
+.Sx \&TP .
+No closure refers to an explicit block closing macro.
+.Pp
+As a rule, block macros may not be nested; thus, calling a block macro
+while another block macro scope is open, and the open scope is not
+implicitly closed, is syntactically incorrect.
+.Pp
+.Bl -column -compact -offset indent "MacroX" "ArgumentsX" "Head ScopeX" "sub-sectionX" "compatX"
+.It Em Macro Ta Em Arguments Ta Em Head Scope Ta Em Body Scope Ta Em Notes
+.It Sx \&HP Ta <2 Ta current Ta paragraph Ta \&
+.It Sx \&IP Ta <3 Ta current Ta paragraph Ta \&
+.It Sx \&LP Ta 0 Ta current Ta paragraph Ta \&
+.It Sx \&P Ta 0 Ta current Ta paragraph Ta \&
+.It Sx \&PP Ta 0 Ta current Ta paragraph Ta \&
+.It Sx \&RE Ta 0 Ta current Ta none Ta compat
+.It Sx \&RS Ta 1 Ta current Ta part Ta compat
+.It Sx \&SH Ta >0 Ta next-line Ta section Ta \&
+.It Sx \&SS Ta >0 Ta next-line Ta sub-section Ta \&
+.It Sx \&TP Ta n Ta next-line Ta paragraph Ta \&
+.El
+.Pp
+Macros marked
+.Qq compat
+are as mentioned in
+.Sx Line Macros .
+.Pp
+If a block macro is next-line scoped, it may only be followed by in-line
+macros for decorating text.
+.Sh REFERENCE
+This section is a canonical reference to all macros, arranged
+alphabetically.
+For the scoping of individual macros, see
+.Sx MACRO SYNTAX .
+.Ss \&AT
+Sets the volume for the footer for compatibility with man pages from
+.Tn AT&T UNIX
+releases.
+The optional arguments specify which release it is from.
+.Ss \&B
+Text is rendered in bold face.
+.Pp
+See also
+.Sx \&I
+and
+.Sx \&R .
+.Ss \&BI
+Text is rendered alternately in bold face and italic.
+Thus,
+.Sq .BI this word and that
+causes
+.Sq this
+and
+.Sq and
+to render in bold face, while
+.Sq word
+and
+.Sq that
+render in italics.
+Whitespace between arguments is omitted in output.
+.Pp
+Examples:
+.Pp
+.Dl \&.BI bold italic bold italic
+.Pp
+The output of this example will be emboldened
+.Dq bold
+and italicised
+.Dq italic ,
+with spaces stripped between arguments.
+.Pp
+See also
+.Sx \&IB ,
+.Sx \&BR ,
+.Sx \&RB ,
+.Sx \&RI ,
+and
+.Sx \&IR .
+.Ss \&BR
+Text is rendered alternately in bold face and roman (the default font).
+Whitespace between arguments is omitted in output.
+.Pp
+See
+.Sx \&BI
+for an equivalent example.
+.Pp
+See also
+.Sx \&BI ,
+.Sx \&IB ,
+.Sx \&RB ,
+.Sx \&RI ,
+and
+.Sx \&IR .
+.Ss \&DT
+Has no effect.
+Included for compatibility.
+.Ss \&HP
+Begin a paragraph whose initial output line is left-justified, but
+subsequent output lines are indented, with the following syntax:
+.Bd -filled -offset indent
+.Pf \. Sx \&HP
+.Op Cm width
+.Ed
+.Pp
+The
+.Cm width
+argument must conform to
+.Sx Scaling Widths .
+If specified, it's saved for later paragraph left-margins; if unspecified, the
+saved or default width is used.
+.Pp
+See also
+.Sx \&IP ,
+.Sx \&LP ,
+.Sx \&P ,
+.Sx \&PP ,
+and
+.Sx \&TP .
+.Ss \&I
+Text is rendered in italics.
+.Pp
+See also
+.Sx \&B
+and
+.Sx \&R .
+.Ss \&IB
+Text is rendered alternately in italics and bold face.
+Whitespace between arguments is omitted in output.
+.Pp
+See
+.Sx \&BI
+for an equivalent example.
+.Pp
+See also
+.Sx \&BI ,
+.Sx \&BR ,
+.Sx \&RB ,
+.Sx \&RI ,
+and
+.Sx \&IR .
+.Ss \&IP
+Begin an indented paragraph with the following syntax:
+.Bd -filled -offset indent
+.Pf \. Sx \&IP
+.Op Cm head Op Cm width
+.Ed
+.Pp
+The
+.Cm width
+argument defines the width of the left margin and is defined by
+.Sx Scaling Widths .
+It's saved for later paragraph left-margins; if unspecified, the saved or
+default width is used.
+.Pp
+The
+.Cm head
+argument is used as a leading term, flushed to the left margin.
+This is useful for bulleted paragraphs and so on.
+.Pp
+See also
+.Sx \&HP ,
+.Sx \&LP ,
+.Sx \&P ,
+.Sx \&PP ,
+and
+.Sx \&TP .
+.Ss \&IR
+Text is rendered alternately in italics and roman (the default font).
+Whitespace between arguments is omitted in output.
+.Pp
+See
+.Sx \&BI
+for an equivalent example.
+.Pp
+See also
+.Sx \&BI ,
+.Sx \&IB ,
+.Sx \&BR ,
+.Sx \&RB ,
+and
+.Sx \&RI .
+.Ss \&LP
+Begin an undecorated paragraph.
+The scope of a paragraph is closed by a subsequent paragraph,
+sub-section, section, or end of file.
+The saved paragraph left-margin width is reset to the default.
+.Pp
+See also
+.Sx \&HP ,
+.Sx \&IP ,
+.Sx \&P ,
+.Sx \&PP ,
+and
+.Sx \&TP .
+.Ss \&P
+Synonym for
+.Sx \&LP .
+.Pp
+See also
+.Sx \&HP ,
+.Sx \&IP ,
+.Sx \&LP ,
+.Sx \&PP ,
+and
+.Sx \&TP .
+.Ss \&PP
+Synonym for
+.Sx \&LP .
+.Pp
+See also
+.Sx \&HP ,
+.Sx \&IP ,
+.Sx \&LP ,
+.Sx \&P ,
+and
+.Sx \&TP .
+.Ss \&R
+Text is rendered in roman (the default font).
+.Pp
+See also
+.Sx \&I
+and
+.Sx \&B .
+.Ss \&RB
+Text is rendered alternately in roman (the default font) and bold face.
+Whitespace between arguments is omitted in output.
+.Pp
+See
+.Sx \&BI
+for an equivalent example.
+.Pp
+See also
+.Sx \&BI ,
+.Sx \&IB ,
+.Sx \&BR ,
+.Sx \&RI ,
+and
+.Sx \&IR .
+.Ss \&RE
+Explicitly close out the scope of a prior
+.Sx \&RS .
+.Ss \&RI
+Text is rendered alternately in roman (the default font) and italics.
+Whitespace between arguments is omitted in output.
+.Pp
+See
+.Sx \&BI
+for an equivalent example.
+.Pp
+See also
+.Sx \&BI ,
+.Sx \&IB ,
+.Sx \&BR ,
+.Sx \&RB ,
+and
+.Sx \&IR .
+.Ss \&RS
+Begin a part setting the left margin.
+The left margin controls the offset, following an initial indentation,
+to un-indented text such as that of
+.Sx \&PP .
+This has the following syntax:
+.Bd -filled -offset indent
+.Pf \. Sx \&Rs
+.Op Cm width
+.Ed
+.Pp
+The
+.Cm width
+argument must conform to
+.Sx Scaling Widths .
+If not specified, the saved or default width is used.
+.Ss \&SB
+Text is rendered in small size (one point smaller than the default font)
+bold face.
+.Ss \&SH
+Begin a section.
+The scope of a section is only closed by another section or the end of
+file.
+The paragraph left-margin width is reset to the default.
+.Ss \&SM
+Text is rendered in small size (one point smaller than the default
+font).
+.Ss \&SS
+Begin a sub-section.
+The scope of a sub-section is closed by a subsequent sub-section,
+section, or end of file.
+The paragraph left-margin width is reset to the default.
+.Ss \&TH
+Sets the title of the manual page with the following syntax:
+.Bd -filled -offset indent
+.Pf \. Sx \&TH
+.Ar title section date
+.Op Ar source Op Ar volume
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