Really simple abbreviation I can't do

I hesitate to ask this question, since it appears to be so simple, but the
answer ought to be useful to a lot of people.

There are many constructs in most programming languages which involve
paired characters - {} () [] particularly. It would be helpful for the
first character (or the pair) to insert both ends, then skip back between
them and start inserting. (That avoids leaving unbalances around.)

Despite trying all sorts of combinations, I've been unable to achieve an
abbreviation sequence that doesn't insert a space, either before or
between the pair. Is there one?

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