Use the ClustalW algorithm to align the following DNA sequences:

Sequence $1$: ATCGTAC

Sequence $2$: ATGCT

Sequence $3$: ACGTACT

The scoring scheme is $+1$ for a match, $-1$ for a mismatch, and $-2$ for a gap penalty. Show the steps in the algorithm, report the MSA and compute its sum of pairs alignment score.

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