private void MergeDecisions()
{
var allData = new List <Decisions>();
var dataInProper = new List <Decisions>();
for (int i = 0; i < databases.Length; i++)
{
var l = Decisions.Read(this.databases[i]);
if (i == 0)
{
dataInProper = l;
}
allData.AddRange(l);
}
var toWrite = this.SubtractHashSet(new HashSet <Decisions>(allData), new HashSet <Decisions>(dataInProper));
Decisions.Insert(this.proper, toWrite);
}