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:
British Rail Class 483
Table title:
Fleet details
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=2 > Unit No. </th><th colspan=4 rowspan=1 > Vehicle Nos. </th><th colspan=2 rowspan=1 > Delivered to LPTB </th><th colspan=1 rowspan=2 > Livery </th><th colspan=1 rowspan=2 > Status </th></tr>
<tr> <th colspan=2 rowspan=1 > DMSO(A) </th><th colspan=2 rowspan=1 > DMSO(B) </th><th colspan=1 rowspan=1 > DMSO(A) </th><th colspan=1 rowspan=1 > DMSO(B) </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 483001 </td><td class="highlighted"  colspan=1 rowspan=1 > 121 </td><td colspan=1 rowspan=1 > ex-10184 </td><td class="highlighted"  colspan=1 rowspan=1 > 225 </td><td colspan=1 rowspan=1 > ex-11142 </td><td colspan=1 rowspan=1 > 19 Aug 1939 </td><td colspan=1 rowspan=1 > 27 Feb 1939 </td><td colspan=1 rowspan=1 > NSE </td><td colspan=1 rowspan=1 > Scrapped at Ryde St Johns Road, June 2006. </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 483002 </td><td class="highlighted"  colspan=1 rowspan=1 > 122 </td><td colspan=1 rowspan=1 > ex-10221 </td><td class="highlighted"  colspan=1 rowspan=1 > 222 </td><td colspan=1 rowspan=1 > ex-11221 </td><td colspan=1 rowspan=1 > 13 Nov 1939 </td><td colspan=1 rowspan=1 > 13 Nov 1939 </td><td colspan=1 rowspan=1 > London Transport Red </td><td colspan=1 rowspan=1 > Stored at Ryde St Johns Road since 2008, being stripped for spare parts. </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 483003 </td><td class="highlighted"  colspan=1 rowspan=1 > 123 </td><td colspan=1 rowspan=1 > ex-10116 </td><td class="highlighted"  colspan=1 rowspan=1 > 221 </td><td colspan=1 rowspan=1 > ex-11184 </td><td colspan=1 rowspan=1 > 10 Jan 1939 </td><td colspan=1 rowspan=1 > 19 Aug 1939 </td><td colspan=1 rowspan=1 > NSE </td><td colspan=1 rowspan=1 > This unit was stored in a siding near Ryde St. Johns Road for spare parts and was broken up in April 2000 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 483004 </td><td class="highlighted"  colspan=1 rowspan=1 > 124 </td><td colspan=1 rowspan=1 > ex-10205 </td><td class="highlighted"  colspan=1 rowspan=1 > 224 </td><td colspan=1 rowspan=1 > ex-11205 </td><td colspan=1 rowspan=1 > 10 Oct 1939 </td><td colspan=1 rowspan=1 > 10 Oct 1939 </td><td colspan=1 rowspan=1 > London Transport Red </td><td colspan=1 rowspan=1 > In service. </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 483005 </td><td class="highlighted"  colspan=1 rowspan=1 > 125 </td><td colspan=1 rowspan=1 > ex-10142 </td><td class="highlighted"  colspan=1 rowspan=1 > 223 </td><td colspan=1 rowspan=1 > ex-11116 </td><td colspan=1 rowspan=1 > 27 Feb 1939 </td><td colspan=1 rowspan=1 > 10 Jan 1939 </td><td colspan=1 rowspan=1 > NSE </td><td colspan=1 rowspan=1 > Scrapped at Ryde in April 2000 </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 483006 </td><td class="highlighted"  colspan=1 rowspan=1 > 126 </td><td colspan=1 rowspan=1 > ex-10297 </td><td class="highlighted"  colspan=1 rowspan=1 > 226 </td><td colspan=1 rowspan=1 > ex-11297 </td><td colspan=1 rowspan=1 > 1 July 1940 </td><td colspan=1 rowspan=1 > 1 July 1940 </td><td colspan=1 rowspan=1 > London Transport Red </td><td colspan=1 rowspan=1 > In service. </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 483007 </td><td class="highlighted"  colspan=1 rowspan=1 > 127 </td><td colspan=1 rowspan=1 > ex-10291 </td><td class="highlighted"  colspan=1 rowspan=1 > 227 </td><td colspan=1 rowspan=1 > ex-11291 </td><td colspan=1 rowspan=1 > 17 Jun 1940 </td><td colspan=1 rowspan=1 > 17 Jun 1940 </td><td colspan=1 rowspan=1 > London Transport Red </td><td colspan=1 rowspan=1 > In service. </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 483008 </td><td class="highlighted"  colspan=1 rowspan=1 > 128 </td><td colspan=1 rowspan=1 > ex-10255 </td><td class="highlighted"  colspan=1 rowspan=1 > 228 </td><td colspan=1 rowspan=1 > ex-11255 </td><td colspan=1 rowspan=1 > 26 Feb 1940 </td><td colspan=1 rowspan=1 > 26 Feb 1940 </td><td colspan=1 rowspan=1 > London Transport Red </td><td colspan=1 rowspan=1 > In service. </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 483009 </td><td class="highlighted"  colspan=1 rowspan=1 > 129 </td><td colspan=1 rowspan=1 > ex-10289 </td><td class="highlighted"  colspan=1 rowspan=1 > 229 </td><td colspan=1 rowspan=1 > ex-11289 </td><td colspan=1 rowspan=1 > 10 Jun 1940 </td><td colspan=1 rowspan=1 > 10 Jun 1940 </td><td colspan=1 rowspan=1 > London Transport Red </td><td colspan=1 rowspan=1 > Stored at Ryde St Johns Road since 2019, being stripped for spare parts. </td></tr>
<tr> <td colspan=1 rowspan=1 > (483010) </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > ex-10139 </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > ex-11172 </td><td colspan=1 rowspan=1 > 20 Feb 1939 </td><td colspan=1 rowspan=1 > 13 Jul 1939 </td><td colspan=1 rowspan=1 > Blue undercoat </td><td colspan=1 rowspan=1 > Most of 483010 was gutted out at Ryde St Johns Road for spares in 2001. The unit has since been scrapped. </td></tr>
</table>
Question:
How many vehicles formed each unit, and what was the numbering possibilities for each of the vehicles?
Answer:
Each unit was formed by two vehicles, numbered 121–129 and 221–229.