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create table words ( Word varchar(64), Category varchar(64)); insert into words values ('human', 'social'), ('politic', 'social'), ('law', 'social'), ('artificial', 'science'), ('intelligence', 'science'); select concat(w.Word, ' - ', w1.Word) Words, w.Category from words w join words w1 on w.Category = w1.Category where w.Word < w1.Word ;
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