N-Triples also has a convention for expressing anonymous nodes (also known as blank nodes).
N - Triples还有一个表示匿名节点(也称为空节点)的约定。
Blank nodes are in the form _ : name, where name is an identifier for that blank node within a given set of N-Triples.
空节点的形式是_：name，其中name是给定的n - Triples集内该空节点的标识。
Blank endorsement n. an endorsement on a check or negotiable note that names no payee making it payable to the bearer.
不记名背书：一种支票或流通票据的背书，没有收款人名字，可支付给持票人。
For each case, output sum (n) in one line, followed by a blank line. You may assume the result will be in the range of 32-bit signed integer.
对于每一种情况，SUM在空白行之后的单独的一行输出。假定所有的结果都在有符号的32位整型范围之内。
The output format consists of N output blocks. There is a blank line between output blocks.
注意：输出每组结果之间有空格，最后一行无空格，格式不对不能。
The output format consists of N output blocks. There is a blank line between output blocks.
注意：输出每组结果之间有空格，最后一行无空格，格式不对不能。
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