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$_->[1] = "B" for @sort_a_pos[0 .. $pct];
$_->[1] = "-" for @sort_a_pos[$pct+1 .. $#array-$pct-1];
$_->[1] = "A" for @sort_a_pos[$#array-$pct .. $#array];

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$_->[1] = "B" for @sort_a_pos[0 .. $pct-1];
$_->[1] = "-" for @sort_a_pos[$pct .. $#array-$pct-1];
$_->[1] = "A" for @sort_a_pos[$#array-$pct .. $#array];