What type of details about shitou xiqian can be gathered from the following bio? Bio: shitou xiqian -lrb- 700-790 -rrb- -lrb- -rrb- was an 8th-century chinese chan -lrb- zen -rrb- buddhist teacher and author . all existing branches of zen throughout the world are said to descend either from shitou xiqian or from his contemporary mazu daoyi .
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