In the method of determining a motion vector for deriving motion vectors of a bi-predictive image block, a list 1 motion vector of a co-located image block for a bi-predictive image block is selected as a motion vector for deriving motion vectors of the bi-predictive image block when the co-located image block only has a list 1 motion vector.

 
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> Toner cartridge and method of attached guide member therein

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