Indian Politics
Concurrent list freedom of trade commerce and joint sitting of the two houses of parliament are the provisions mentioned in Indian constitution. They have been borrowed from:

Japanese constitution
Australian constitution
American constitution
Irish constitution

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Indian Politics
The function of Protem Speaker is to-

Swearing in members and hold charge till a regular Speaker is elected
Conduct the Proceedings of the House in the absence of the Speaker
Check if the election certificates of members are in order
Officiate as Speaker when a Speaker is unlikely to be elected

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