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    4¡¢Build an initial crystal structure by copying the molecules and/or atoms that form the asymmetric unit from their 3D model documents into the empty lattice constructed in steps 1 and 2 above. Use the ¡°Edit/Copy¡±and ¡°Edit /Paste¡± commands to do this. £¨°Ñ2²½ÖèÀï»­ºÃµÄ·Ö×ӽṹ¿½½ø1²½ÖèÀィºÃµÄ¿Õµ¥°ûÖУ©¡£
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