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:
| Seat | Series 1 | Series 3 | Series 4 | Series 5 |
| --- | --- | --- | --- | --- |
| 1.0 | Niall O'Farrell | Niall O'Farrell | Niall O'Farrell | Peter Casey (businessman) |
| 2.0 | Bobby Kerr | Bobby Kerr | Bobby Kerr | Ramona Nicholas |
| 3.0 | Sarah Newman | Norah Casey | Sean O'Sullivan | Sean O'Sullivan |
| 4.0 | Gavin Duffy | Gavin Duffy | Gavin Duffy | Gavin Duffy |
| 5.0 | Seán Gallagher | Seán Gallagher | Norah Casey | Barry O'Sullivan |
Question:
What is the series 4 with sarah newman in series 1?
Answer:
Sean O'Sullivan