Sajjan Singh and Others vs The State of Rajasthan -30/10/1964

As long as the words ‘sovereign democratic republic’ are there, could the Constitution be amended so as to depart from the democratic form of Government or its republic character? If that cannot be done, then, as long as the words “justice, social, economic and political etc.”, are there could any of the rights enumerated in Arts. 14, to 19, 21, 25, 31 and 32 be taken away?