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sub sumTo {
    my $target = shift;
    ...
}

sub sumTo {
    my $target = shift;
...
    }
    return 0;
}

sub sumTo {
    my $target = shift;
...
    }
    return 0;
}

sub sumTo {
    my $target = shift;
...
    }
    return 0;
}

@_[0 .. $_-1, $_+1 .. $#_]