question: Along with centralization , what reason is given for the lack of records in non-Wessex dialects after the unification of Alfred ?
answer: the Viking invasions
turker_answer: Along with centralization , the Viking invasions are a reason for the lack of records in non-Wessex dialects after the unification of Alfred .
rule-based: Along with centralization , the Viking invasions is given for the lack of records in non-Wessex dialects after the unification of Alfred .