A logic problem by Christopher Boo

Logic Level 1

\[\large \begin{matrix} &&& & & \square \\ &&& & \square & \square \\ + & & & \square & \square & \square \\ \hline \\ & & 1 & 1 & 1 & 1 \end{matrix} \]

Each box contains a non-zero digit, not necessarily distinct from other numbers. Is the equation above possible?

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