This contribution reports the experimental results of EE2-3.6. It proposes to select the cost function based on the merge index in the merge mode for motion vector refinement process. Alternating between the two cost functions, which are selected based on the parity of the merge index, allows for the refinement of the merge candidates in a merge list with different cost functions. The proposed method is applied to the regular merge, bilateral matching merge, template matching merge and affine merge modes. The proposed method reports the following BD-rate performance on top of ECM-13.0: