Solve each of the following Cryptarithm:
$\mathrm{B}+1=8, \mathrm{~B}=7$
$\mathrm{A}+\mathrm{B}=1, \mathrm{~A}+7=1, \mathrm{~A}=4$
So, $\mathrm{A}=4, \mathrm{~B}=7$
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