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I had asked GAP Forum the follwoing question

Here is my question:

I have a set S with 30 elements, together with a symmetric binary relation R, which

holds between some of the elements of S. I would like to find out all the

permutations of S which preserve the relation R, in the following precise sense

f: S to S, f bijection satisfying "a R b if and only if f(a) R f(b)".Is there any program in GAP that would allow me to do that?

and have received the answer that grape would do it. I went to a computer with gap

installed on it, read the book containing the documentation on it, and have tried first

with a small example to see whether the whole thing works, and to my surprise have

found that it doesn't. Here is what I did. I defined

gamma := EdgeOrbitsGraph( Group( () ), [[1,2],[2,3],[2,1],[3,2]], 5 )

followed by eithe ; or ;; regardless of which produced the message from gap that

EdgeOrbitsGraph requires a value for the variable. I have tried to leave no spaces,

and small cahnges of the kind, all to no avail.

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