The Space flag (#) produces one unexpandable space (not affected
by justification) in the output file for every flag character
inserted in the input file. If you insert the flag between two
words, DSR treats them as one word (although they will appear
as separate words in the output file). Therefore, you should not
type any spaces before or after typing the Space flag.
The flag can directly follow an Underline flag (&#) to cause the
underlining of an unexpandable space.