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1+1=
2
2+2=
4
3+3=
6
4+4=
8
5+5=
10
6+6=
12
7+7=
14
8+8=
16
9+9=
18
10+10=
20
11+11=
22
12+12=
24
13+13=
26
14+14=
28
15+15=
30
16+16=
32
17+17=
34
18+18=
36
19+19=
38
20+20=
40
Braineos