Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Leaving Certificate (Ireland)
Table title:
Grading and available subjects
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=2 > Percentage </th><th colspan=1 rowspan=2 > Grade </th><th colspan=3 rowspan=1 > Points Awarded </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > Higher </td><td class="highlighted"  colspan=1 rowspan=1 > Ordinary </td><td class="highlighted"  colspan=1 rowspan=1 > Foundation </td></tr>
<tr> <td colspan=1 rowspan=1 > 90-100% </td><td colspan=1 rowspan=1 > H1-O1–F1 </td><td colspan=1 rowspan=1 > 100 </td><td colspan=1 rowspan=1 > 56 </td><td colspan=1 rowspan=1 > 20 </td></tr>
<tr> <td colspan=1 rowspan=1 > 80-89% </td><td colspan=1 rowspan=1 > H2-O2–F2 </td><td colspan=1 rowspan=1 > 88 </td><td colspan=1 rowspan=1 > 46 </td><td colspan=1 rowspan=1 > 12 </td></tr>
<tr> <td colspan=1 rowspan=1 > 70-79% </td><td colspan=1 rowspan=1 > H3-O3–F3 </td><td colspan=1 rowspan=1 > 77 </td><td colspan=1 rowspan=1 > 37 </td><td colspan=1 rowspan=1 > 0 </td></tr>
<tr> <td colspan=1 rowspan=1 > 60-69% </td><td colspan=1 rowspan=1 > H4-O4–F4 </td><td colspan=1 rowspan=1 > 66 </td><td colspan=1 rowspan=1 > 28 </td><td colspan=1 rowspan=1 > 0 </td></tr>
<tr> <td colspan=1 rowspan=1 > 50-59% </td><td colspan=1 rowspan=1 > H5-O5–F5 </td><td colspan=1 rowspan=1 > 56 </td><td colspan=1 rowspan=1 > 20 </td><td colspan=1 rowspan=1 > 0 </td></tr>
<tr> <td colspan=1 rowspan=1 > 40-49% </td><td colspan=1 rowspan=1 > H6-O6–F6 </td><td colspan=1 rowspan=1 > 46 </td><td colspan=1 rowspan=1 > 12 </td><td colspan=1 rowspan=1 > 0 </td></tr>
<tr> <td colspan=1 rowspan=1 > 30-39% </td><td colspan=1 rowspan=1 > H7-O7–F7 </td><td colspan=1 rowspan=1 > 37 </td><td colspan=1 rowspan=1 > 0 </td><td colspan=1 rowspan=1 > 0 </td></tr>
<tr> <td colspan=1 rowspan=1 > 0-29% </td><td colspan=1 rowspan=1 > H8-O8–F8 </td><td colspan=1 rowspan=1 > 0 </td><td colspan=1 rowspan=1 > 0 </td><td colspan=1 rowspan=1 > 0 </td></tr>
</table>
Question:
What are the three levels where each subject is examined?
Answer:
Each subject is examined at one of three levels, Higher, Ordinary, or Foundation.