The comm command in Unix is a utility that is used to compare two files. It shows common lines in one column and differing lines in separate columns for left and right files. This functionally is similar to diff.
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... (1863-1942), India and Tibet
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Zhang Qian[?] - spent 12 years starting in 138 BC exploring much of Central Asia for Emperor Han Wu Di[?]
Zheng He, (1371-1435), ...