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Form_space 'file' [-a] [-s] [-p=prime]file: bravais_TYP containing the unimodular group G.
-a:       all invariant matrices are calculated
-s:       only the skew-symmetric invariant matrices are calculated
-p=prime: the mod-p-invariant matrices, and a basis over Z/pZ is given.
          The default prime is  101.
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