Bullish Concealing Baby Swallow [UCBS]

Rules:
1. The first candlestick is a red candlestick without shadows.
2. The second candlestick is a red candlestick without shadows.
3. The third candlestick gaps down below the second bar, it has a long upper shadow in the range of the second candlestick but it closes below the second candlestick.
4. The fourth candlestick is a red candlestick without shadows which engulfs the third candlestick including all of its shadow.

Pattern Type:
Bullish Reversal.

	 ' Assign the parameters to script variables.
	_symbolIndex = symbolIndex

	 ' Get the opening prices of the symbol, indexed by bar index. 
	Define open() As Number = BarOpen(_symbolIndex, barIndex, 4)
	 ' Get the highest prices of the symbol, indexed by bar index. 
	Define high() As Number = BarHigh(_symbolIndex, barIndex, 4)
	 ' Get the lowest prices of the symbol, indexed by bar index. 
	Define low() As Number = BarLow(_symbolIndex, barIndex, 4)
	 ' Get the closing prices of the symbol, indexed by bar index. 
	Define close() As Number = BarClose(_symbolIndex, barIndex, 4)
	 ' Check whether the first candlestick matches.
	If (open(3) > close(3) And _
		high(3) = open(3) And _
		low(3) = close(3)) Then
		 ' Check whether the second candlestick matches.
		If (open(2) > close(2) And _
			high(2) = open(2) And _
			low(2) = close(2)) Then
			 ' Check whether the third candlestick matches.
			If (open(1) > close(1) And _
				open(1) < close(2) And _
				high(1) > close(2)) Then
				 ' Check whether the fourth candlestick matches.
				If (open(0) > close(0) And _
					open(0) >= high(1) And _
					close(0) < low(1)) Then
					Return 4
				End If
			End If
		End If
	End If
	Return 0