sequence has at most just a single message number, not a range.
.PP
Sequence names have a maximum size of 998 characters. Each line is also
-limited to a maximum of 998 characters, but RFC\-822 continuation rules
+limited to a maximum of 998 characters, but RFC 822 continuation rules
apply; sequences can be continued across multiple lines by prefixing
continuation lines with a whitespace character.
.PP