"As far as I know from reading the vim list, etc., there is no way
"of getting rid of the extra spaces. Either backspace or hit
"Ctrl-] once you have unambiguously determined the abbreviation.
"For targets and references you must have no surrounding spaces.

iunab ,i
iunab ,l
iunab ,r
iunab ,c
iunab ,C
iunab ,#
iunab ,t
iunab {+
iunab {-
iunab }+
iunab }-
iunab ,^