
p1.


or

	A0 ---- X ----+
		      |
                      +---- X ---- C0
		      |
	B0 ---- X ----+



	A1 ---- X ----+
		      |
                      +---- X ---- C1
		      |
	B1 ---- X ----+



	A2 ---- X ----+
		      |
                      +---- X ---- C2
		      |
	B2 ---- X ----+



	A3 ---- X ----+
		      |
                      +---- X ---- C3
		      |
	B3 ---- X ----+



	A4 ---- X ----+
		      |
                      +---- X ---- C4
		      |
	B4 ---- X ----+



	A5 ---- X ----+
		      |
                      +---- X ---- C5
		      |
	B5 ---- X ----+



	A6 ---- X ----+
		      |
                      +---- X ---- C6
	      	      |
	B6 ---- X ----+



	A7 ---- X ----+
		      |
                      +---- X ---- C7
	      	      |
	B7 ---- X ----+




exact duplicated stages




if the output of any first stage is low the output of that is low, 

	-> high output,
	
	any high input -> high output (or)


