The commonly-used spelling of a crystallographic space group does not match the correct definition given by the Herman-Mauguin symbols which define all space groups in a unique and precise way. This function attempt to translate a tentative string into a possible Herman-Mauguin symbol, if it finds one. If the input string is already in the extended Herman-Mauguin form, the same string is returned as output.
A character string. The space group symbol in its commonly-used spelling.
SG A character string. The extended Hermann-Mauguin symbol (e.g. 'P 1 1 21').
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