@Override
		public boolean equals(Object obj) {
			if (this == obj)
				return true;
			if (obj == null)
				return false;
			if (getClass() != obj.getClass())
				return false;
			P other = (P) obj;
			if (e != other.e)
				return false;
			if (s != other.s)
				return false;
			return true;
		}