[see also: obstruction, prevent]
The obstacle we have is that we must control the area of $G$.
It might seem at first that the only obstacle is the fact that the group is not compact.
There are two obstacles to this approach.
It is possible that the methods of this paper could be used to ......, but there remain considerable obstacles to overcome.
We are able to surmount this obstacle by an error analysis of the rate of convergence.
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