$\begin{array} { l l l } & A & B \\ & C & D \\ + & E & F \\ \hline & G & H \\ \end{array}$

In the above cryptogram, all the letters represent distinct digits from 1 to 9.

What is the **minimum possible value** of $\overline{GH}$?

For a greater challenge, try Cryptotastic #2.

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