r><td>1</td><td>01</td><td>-0</td><td>-3</td></tr>
	<tr><td>2</td><td>02</td><td>-+</td><td>-2</td></tr>
	<tr><td>3</td><td>10</td><td>0-</td><td>-1</td></tr>
	<tr><td>4</td><td>11</td><td>00</td><td>0</td></tr>
	<tr><td>5</td><td>12</td><td>0+</td><td>1</td></tr>
	<tr><td>6</td><td>20</td><td>+-</td><td>2</td></tr>
	<tr><td>7</td><td>21</td><td>+0</td><td>3</td></tr>
	<tr><td>8</td><td>22</td><td>++</td><td>4</td></tr>
</table>

<p>Arithmetic is nearly as simple as it is with binary numbers; in particular,