\# pdfroff -ms margins.ms >margins.pdf
.nr PO 1c
.nr LL 21c-\n(PO-1c
.nr HM 1c
.\" FIXME: The actual bottom border is much larger.
.nr FM 1c
.nr PI 0
.\" Disable headers and footers
.ds CH
.ds CF
.
BEFORE
.2C
AFTER
.
.nr i 0 1
.while \n+i<=100 \{\
.  br
.  nop \ni
.\}