当我们使用bwa或者bowtie map reads之后，当我们察看日志文件，我们会看到诸如：

20164115 reads; of these:
  20164115 (100.00%) were unpaired; of these:
    255188 (1.27%) aligned 0 times
    14142345 (70.14%) aligned exactly 1[......]
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