1. Smith Adder

3. Beaumont-Smith
7 6 5 4 3 2 1 0 G1:0=G1+P1G0
G2:1=G2+P2G1
G2:0=G2+P2G1+P2P1G0
G7:0=G7:4+P7:4G4:0
G3:2=G3+P3G2
6-5 5-4 3-2 2-1 1-0
P7:4=P7P5P4 7-6
11 5 3 G3:1=G3+P3G2+P3P2G1
13
7-5 9 3-1 1
6-4 6 2-0 G3:0=G3+P3G2+
G7:4=G7+P7G6+P7P6G5+P7P6P5G4 18 P3P2G1+P3P2P1G0
3-0
15 3
G7:5=G7+P7G6+P7P6G5 7-4 G4:0=G4+P4G3+P4P3G2
22 6 +P4P3P2G1+P4P3P2P1GO
6-0 5-0 4-0
G5:4=G5+P5G4
7-0
21 15 10
28 G5:0=G5:4+P5:4G4:0
c8 c7 c6 c5 c4 c3 c2 c1 P5:4=P5P4
G6:5=G6+P6G5
G7:6=G7+P7G6 G6:0=G6+P6G5:4+P6P5:4G4:0 G6:4=G6+P6G5+P6P5G4
P5:4=P5P4