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Hello,

1) In the case I know the true structure (I am verifying I use Phaser
    correctly), is there a program to do so?

Some other questions, if I am to write this program by myself:

2) is there a list somewhere of the translation ambiguities for
    each spacegroup?
    For example, in P1 it would say me any translation on any axis
    is fine.

3) is there a list of permissible origins for each space group?
    For example, in P212121 it would say me there are 8 possible choices
    and list them for me.

I already know of symop.lib, but I don't think it has some of the 
information I am looking for.
I also know the csymmatch example program of the clipper library, it 
does part of what I intend to do.

Thanks a lot,
Francois.