Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Rank | Heat | Name | Nationality | Time | Notes |
| --- | --- | --- | --- | --- | --- |
| 1 | 1 | Lacena Golding-Clarke | Jamaica | 12.74 | Q, PB |
| 2 | 1 | Vonette Dixon | Jamaica | 12.83 | Q, PB |
| 3 | 2 | Diane Allahgreen | England | 12.92 | Q, PB |
| 4 | 2 | Brigitte Foster | Jamaica | 12.98 | Q |
| 5 | 2 | Angela Atede | Nigeria | 13.01 | Q, SB |
| 6 | 1 | Angela Whyte | Canada | 13.03 | Q, PB |
| 7 | 1 | Julie Pratt | England | 13.08 | q, PB |
| 8 | 2 | Jacquie Munro | Australia | 13.22 | q |
| 9 | 1 | Melanie Wilkins | England | 13.29 |  |
| 9 | 2 | Sriyani Kulawansa | Sri Lanka | 13.29 |  |
| 11 | 1 | Fiona Cullen | Australia | 13.45 |  |
| 12 | 2 | Rachel King | Wales | 13.58 |  |
| 13 | 2 | Tamsin Stephens | Northern Ireland | 13.59 |  |
| 14 | 1 | Christy Akinremi | Nigeria | 13.73 |  |
|  | 2 | Shabana Khattak | Pakistan | DNF |  |
|  | 1 | Carole Kaboud Mebam | Cameroon | DNS |  |
|  | 1 | Olutoyin Augustus | Nigeria | DNS |  |
Question:
how many women clocked less than 13 secs the women's heat of 100m hurdles?
Answer:
4