I am trying to read from a file with several tuples separated by commas. A sample input file looks like:

> 
> (0, 0), (0, 2), (0, 4), (-1, -1), (0, -2), (1, -1), (-1, -3),
> 
> 
> (-1, 1), (-1, 3), (1, 1), (1, 3), (1, 5), (2, 0), (2, 2), (3, 3),
> 
> 
> (2, 4), (3, 5), (4, 4), (5, 3), (6, 4), (5, 5), (7, 5)
> 
> 
> 

After reading from this file, I need a tuple like this:

```
G = ((0, 0), (0, 2), (0, 4), (-1, -1), (0, -2), (1, -1), (-1, -3), \
(-1, 1), (-1, 3), (1, 1), (1, 3), (1, 5), (2, 0), (2, 2), (3, 3), \
(2, 4), (3, 5), (4, 4), (5, 3), (6, 4), (5, 5), (7, 5))

```

How this can be done efficiently? Regards.