$
c0
c0
c0
c1
0
1
101
+001
110
tile ci IAi IBi Oi ci+1
1 0 0 0 0 0
2 0 0 1 1 0
3 0 1 0 1 0
4 0 1 1 0 1
5 1 0 0 1 0
6 1 0 1 0 1
7 1 1 0 0 1
8 1 1 1 1 1
carry out
IAi
IBi
Oi
~c1i+1
c2i+1
~c3i+1
c1i
~c2i
c3i
{
{
carry in
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