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2Â¥: Originally posted by ssssllllnnnn at 2015-11-01 11:41:58
x i is the ith element of x

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´óâ¹û¹û: ½ð±Ò+1, ·­ÒëEPI+1, ¡ï¡ï¡ïºÜÓаïÖú, ·Ç³£¸Ðл 2015-11-01 16:45:19
is the ith element of set X.
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