Example: Cryptarithmetic
n Variables: F T U W
R O X1 X2 X3
n Domains: {0,1,2,3,4,5,6,7,8,9}
n Constraints: Alldiff (F,T,U,W,R,O)
n O + O = R + 10 · X1
n X1 + W + W = U + 10 · X2
n X2 + T + T = O + 10 · X3
n X3 = F, T 0, F 0