<P> The assembly was chaired by Dr. Rajendra Prasad when it met as a constituent body, and by G.V. Mavlankar when it met as a legislative body . It completed the task of drafting a constitution in two years, eleven months and eighteen days, at a total expenditure of ₹ 6.4 million . </P> <P> The Constituent Assembly appointed a total of 22 committees to deal with different tasks of constitution - making . Out of these, eight were major committees and the others were minor committees . </P> <Ol> <Li> Drafting Committee--Dr. B.R. Ambedkar </Li> <Li> Union Powers Committee--Jawaharlal Nehru </Li> <Li> Union Constitution Committee--Jawaharlal Nehru </Li> <Li> Provincial Constitution Committee--Sardar Patel </Li> <Li> Advisory Committee on Fundamental Rights, Minorities and Tribal and Excluded Areas--Sardar Patel . This committee had the following subcommittees: <Ol> <Li> Fundamental Rights Sub-Committee--J.B. Kripalani </Li> <Li> Minorities Sub-Committee--Harendra Coomar Mookerjee, </Li> <Li> North - East Frontier Tribal Areas and Assam Excluded & Partially Excluded Areas Sub-Committee--Gopinath Bardoloi </Li> <Li> Excluded and Partially Excluded Areas (Other than those in Assam) Sub-Committee--A.V. Thakkar </Li> </Ol> </Li> <Li> Rules of Procedure Committee--Dr. Rajendra Prasad </Li> <Li> States Committee (Committee for Negotiating with States)--Jawaharlal Nehru </Li> <Li> Steering Committee--Dr. Rajendra Prasad </Li> </Ol> <Li> Drafting Committee--Dr. B.R. Ambedkar </Li>

Who was the head of provincial constitution committee