{---------------- ! -----------------------------}
	public boolean isBetween(Key fromKey, Key toKey) {
		if (fromKey.compareTo(toKey) < 0) {
			if (this.compareTo(fromKey) > 0 && this.compareTo(toKey) < 0) {
				return true;
			}
		} else if (fromKey.compareTo(toKey) > 0) {
			if (this.compareTo(toKey) > 0 || this.compareTo(fromKey) > 0) {
				return true;
			}
		}
		return false;
	}

	{--------------- 2 ------------------------------>
	public boolean isBetween(Key fromKey, Key toKey) {
		if (fromKey.compareTo(toKey) < 0) {
			if (this.compareTo(fromKey) > 0 && this.compareTo(toKey) < 0) {
				return true;
			}
		} else if (fromKey.compareTo(toKey) > 0) {
			if (this.compareTo(toKey) < 0 || this.compareTo(fromKey) > 0) {
				return true;
			}
		}
		return false;
	}