rewrite

rewrite.cs

        private IEnumerable<string> DetermineListOfAllergicMedications(List<string> medications, Dictionary<string, bool> lookupPatientsKnownAllergies)
        {
            return
                medications
                .Where(a => allergyLookup.ContainsKey(a))
                .Select(a => new Tuple<string, List<string>>(a, allergyLookup[a]))
                .Where(a => a.Item2.Any(c => lookupPatientsKnownAllergies.ContainsKey(c)))
                .Select(a => a.Item1);
        }