public override int GetHashCode()
{
unchecked
{
var hashCode = Left != null?Left.GetHashCode() : 0;
hashCode = (hashCode * 397) ^ (Right != null ? Right.GetHashCode() : 0);
hashCode = (hashCode * 397) ^ (Oper != null ? Oper.GetHashCode() : 0);
return(hashCode);
}
}