.eo
.\" s -- setup document (configurable)
.de s
.sp 1i
._d t \" title
. ps +4p
. vs +2p
. ft B
. ad c
._d
._d n \" name (of author)
. ad c
._d
._d d \" date
. ad c
._d
._d p \" paragraph
. ad b
._d
..
.\" _d -- define environment
.de _d
. ev \$1
..
.\" _e -- enter environment
.de _e
. ev
. ds penv \*[env]
. ds env \$1
. ev \$1
..
.\" t -- title
.de t
. _e t
..
.\" n -- name (of author)
.de n
.  br
. _e n
.  sp 0.3v
..
.\" d -- date
.de d
.  br
. _e d
.  sp 0.3v
.  af mo 00
.  af dy 00
.  ie '\$1'' \n[year]-\n(mo-\n(dy
.  el \$1
.  af mo 1
.  af dy 1
..
.\" p -- paragraph
.de p
.  br
. _e p
.  sp 0.3v
.  if '\*[penv]'t' .sp 0.5v
.  if '\*[penv]'n' .sp 0.5v
.  if '\*[penv]'d' .sp 0.5v
.  if '\*[penv]'p' \h'0.5c'
..
.\" e -- emphasis
.de e
\$3\fI\$1\fP\$2
..
.\" x -- extra emphasis
.de x
\$3\f(BI\$1\fP\$2
..
.ec
.s