$$-12+26-8+15+23-20-25+10$$
$9$
$$14-8+15+23-20-25+10$$
$$6+15+23-20-25+10$$
$$21+23-20-25+10$$
$$44-20-25+10$$
$$24-25+10$$
$$-1+10$$
$$9$$
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$3^{2}$