<td>18 /<em>r</em></td>
<td>SBB <em>r/m8, r8</em></td>
<td>MR</td>
<td>Valid</td>
<td>Valid</td>
<td>Subtract with borrow <em>r8</em> from <em>r/m8.</em></td></tr>
<tr>
<td>REX + 18 /<em>r</em></td>
<td>SBB <em>r/m8*, r8</em></td>
<td>MR</td>
<td>Valid</td>
<td>N.E.</td>
<td>Subtract with borrow <em>r8</em> from <em>r/m8.</em></td></tr>
<tr>
<td>19 /<em>r</em></td>
<td>SBB <em>r/m16, r16</em></td>
<td>MR</td>
<td>Valid</td>
<td>Valid</td>
<td>Subtract with borrow <em>r16</em> from <em>r/m16.</em></td></tr>
