S E N D+ M O R E= M O N E Y
0?S,…,Y?9
S ? 0
M ? 0
S…Y all different
1000*S + 100*E + 10*N + D
+ 1000*M + 100*O + 10*R + E
= 10000*M + 1000*O + 100*N + 10*E + Y
S ? {0..9}
E ? {0..9}
N ? {0..9}
D ? {0..9}
M ? {0..9}
O ? {0..9}
R ? {0..9}
Y ? {0..9}
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