Choose the correct alternative for the given relation.

Harp : Drum : : Flute : ?

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Given set : $4718, 5617, 6312, 8314$

Choose the correct alternative for the given relation.

Rampart : Fortress

Choose the correct description for the given relation.

Knight : Rook : Bishop

Author is related to Book in the same way as Choreographer is related to..........?

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Friendly : Inimical