BLEU should use the shortest reference length when tied for distance
BLEU should use the shortest reference length when tied for distance

ucam-smt/ucam-smt,ucam-smt/ucam-smt,ucam-smt/ucam-smt,ucam-smt/ucam-smt,ucam-smt/ucam-smt,ucam-smt/ucam-smt