Singh extended the invitation when he called on Das here, an official release said.
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Singh and his wife Mamta also made a courtesy call on former Chief Minister and senior BJP leader Arjun Munda at the latter's residence in Ranchi.
Munda hosted a dinner in their honour.
Jharkhand Urban Development, Housing and Transport Minister C P Singh and Parliamentary Affairs, Food, Public Distribution and Consumer Affairs Minister Saryu Roy were among other dignitaries present on the occasion.