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SELECT regexp_substr('Republicc Of Africaa', '([a-z])([a-z])+\1', 1, 1, 'i')
FROM dual;
SELECT regexp_substr('Republicc Of Africaa', '([a-z])([a-z])+\2', 1, 1, 'i')
FROM dual;
SELECT regexp_substr('Republicc Of Africaa', '([a-z])([a-z])+\1', 1, 1, 'i') FROM dual;
SELECT regexp_substr('Republicc Of Africaa', '([a-z])([a-z])+\2', 1, 1,'i') FROM dual;