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:
| Year | RR class | RR Nos. | Builder | Builder Nos. | GWR/BR Nos. |
| --- | --- | --- | --- | --- | --- |
| 1910.0 | A | 10–14 | Robert Stephenson & Co. | 3387–3391 | 52–56 |
| 1910.0 | A | 115–119 | Robert Stephenson & Co. | 3392–3396 | 71–75 |
| 1911.0 | A | 15, 18–22 | Hudswell Clarke | 946–951 | 57–62 |
| 1914.0 | A1 | 23–25 | Hudswell Clarke | 1063–1065 | 63–65 |
| 1916.0 | A1 | 26–27 | Hudswell Clarke | 1119–1120 | 66–67 |
| 1918.0 | A1 | 28–30 | Robert Stephenson & Co. | 3660–3662 | 68–70 |
Question:
Name the RR numbers of hudswell clarke and years before 1914
Answer:
15, 18–22