how many times did k. karunakaran serve as the chief minister of kerala, and what were the dates of each tenure?
k. karunakaran served as the chief minister of kerala four times: for a brief period from march 1977 to april 1977, another short term from december 1981 to march 1982, followed by a brief period of president's rule from may 1982 to march 1987, and from june to march 1995.