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Z_equiv 'file1' 'file2' [-f] [-d]file1: bravais_TYP containing G.
-f   : recalculate the formspace of the groups even if it
       is given already.
-d   : some special files for debugging are created. Do not
       use this option unless you know what you are doing.
WARNING: THE GROUPS IN file1 AND file2 HAVE TO BE FINITE!
See also for Bravais_equiv and Is_finite.
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