private async Task <List <string> > FindUniqueWordsAsync(IWordsRepository wordsRepository, List <string> words)
{
var skip = 0;
var take = 100;
var n = words.Count;
var uniqueWords = new List <string>();
while (skip < n)
{
var wordsPart = words
.Skip(skip)
.Take(take)
.ToList();
var foundWords = await wordsRepository.FindAsync(wordsPart);
var uniqueWordsPart = wordsPart
.Except(foundWords.Select(wi => wi.Word));
uniqueWords.AddRange(uniqueWordsPart);
skip += take;
}
return(uniqueWords);
}