Question

how constitution clearly provides a three four distribution of legislative powers beetween the union and state government.

Answer 1

Power has been divided between the Union and the State governments by the Union, State and Concurrent lists. While, the Centre can make laws on the subjects entrusted in the Union list, State Government can make laws on the subjects stated in the State List. While both have the authority to deal with the matters in the Concurrent List.

those subjects which have not been concluded in any of the above 3 lists are residuary subjects. Only the centre has been given the power to make laws in relation to such subjects