Two dissident candidates conceded defeat Sunday in Cuban local elections that offered them a chance to become the first officials elected from outside the Communist Party in 40 years. Hildebrando Chaviano and Yuniel Lopez had been chosen as candidates by a show of hands in Havana neighborhood nominating meetings and hoped to win two of the 12,589 seats at stake in 168 municipal councils. Both acknowledged they had no chance of winning after preliminary results showed Chaviano in last place of four candidates and one of Lopez's pro-government opponent with twice his vote.