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    } elsif ($value == $self->{mid}) {
        $membership = 1;
    } else {
	$membership = (($value - $self->{mid}) * $mDecreasing) + 1;
    }
    
    return $membership;
}

sub range {
    # returns the distance from one endpoint to the other
    
    my ($self) = @_;
    return abs( $self->{high} - $self->{low} );
}

1;