public void Init(List <string> categoryhashes, MongoRepository repo, int count = 0)
{
r = new Random();
_repo = repo;
gamewords = new List <WordModel>();
IEnumerable <WordModel> tmparray = new WordModel[0];
foreach (string item in categoryhashes)
{
var coll = repo.GetCollection(item);
tmparray = tmparray.Concat(coll.ToArray());
}
MixandPrepare(tmparray.ToArray(), gamewords, count);
}