What is the voting round with the least number of blank votes that is part in the Governor election in  2014 in Acre?
select ?ent where { ?ent wdt:P31 wd:Q24097670 . ?ent wdt:P5045 ?obj . ?ent wdt:P361 wd:Q51336711} ORDER BY ASC(?obj)LIMIT 5 
voting round: Q24097670 2014 acre gubernatorial election: Q51336711