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1¹ø½Ä
=IF((11-MOD((LEFT(A1,1)*2+MID(A1,2,1)*3+MID(A1,3,1)*4+MID(A1,4,1)*5+MID(A1,5,1)*6+MID(A1,6,1)*7+MID(A1,8,1)*8+MID(A1,9,1)*9+MID(A1,10,1)*2+MID(A1,11,1)*3+MID(A1,12,1)*4+MID(A1,13,1)*5),11))=7,"True")
2¹ø½Ä
=IF((11-MOD((LEFT(A1,1)*2+MID(A1,2,1)*3+MID(A1,3,1)*4+MID(A1,4,1)*5+MID(A1,5,1)*6+MID(A1,6,1)*7+MID(A1,8,1)*8+MID(A1,9,1)*9+MID(A1,10,1)*2+MID(A1,11,1)*3+MID(A1,12,1)*4+MID(A1,13,1)*5),11))=RIGHT(A1,1),"True")
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