1. remove duplicated entries in bib WARN - Duplicate entry key: 'DBLP:conf/acl/Callison-BurchBS05' in file 'bibliography.bib', skipping ... WARN - Duplicate entry key: 'Wu2016GooglesNM' in file 'bibliography.bib', skipping ... WARN - Duplicate entry key: 'DBLP:conf/coling/XuHJFWHJXZ20' in file 'bibliography.bib', skipping ... WARN - Duplicate entry key: 'DBLP:conf/aclnmt/HuLLLLWXZ20' in file 'bibliography.bib', skipping ... WARN - Duplicate entry key: 'DBLP:conf/emnlp/DeNeefeKWM07' in file 'bibliography.bib', skipping ... WARN - Duplicate entry key: 'DBLP:conf/emnlp/ShiPK16' in file 'bibliography.bib', skipping ... WARN - Duplicate entry key: '2018When' in file 'bibliography.bib', skipping ... WARN - month field 'November' in entry 'zhang-EtAl:2020:WMT' is not an integer - this will probably not sort properly. 2. replace a duplicated use of "DBLP:conf/acl/Callison-BurchBS05" to "DBLP:conf/naacl/McNamee-and-Mayfield06" in chapter7.tex
