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:
| Name | Cyl. | Bore | Capacity | Power | Weight |
| --- | --- | --- | --- | --- | --- |
| 9 AD | 9-cyl radial | mm (in) | l (cuin) | kW (hp) at 2,000rpm | Weight kg (lb) |
| 9 ADb | 9-cyl radial | mm (in) | l (cuin) | kW (hp) at 2,200rpm | Weight kg (lb) |
| 9 ADr | 9-cyl radial | mm (in) | l (cuin) | kW (hp) at 2,700rpm | Weight kg (lb) |
| 7 AC | 7-cyl radial | mm (in) | l (cuin) | kW (hp) at 1,800rpm | Weight kg (lb) |
| 9 AC | 9-cyl radial | mm (in) | l (cuin) | kW (hp) at 1,800rpm | Weight kg (lb) |
| 9 NC | 9-cyl radial | mm (in) | l (cuin) | kW (hp) at 1,800rpm | Weight kg (lb) |
| 9 NCt | 9-cyl radial | mm (in) | l (cuin) | kW (hp) at 1,800rpm | Weight kg (lb) |
| 9 AB | 9-cyl radial | mm (in) | l (cuin) | kW (hp) at 1,700rpm | Weight kg (lb) |
| 9 NA | 9-cyl radial | mm (in) | l (cuin) | kW (hp) at 1,800rpm | Weight kg (lb) |
| 9 NAs | 9-cyl radial | mm (in) | l (cuin) | kW (hp) at 1,800rpm | Weight kg (lb) |
| 18 AB | 18-cyl 2-row radial | mm (in) | l (cuin) | kW (hp) at 1,700rpm | Weight kg (lb) |
| 18 ABs | 18-cyl 2-row radial | mm (in) | l (cuin) | kW (hp) at 1,700rpm | Weight kg (lb) |
Question:
What bore goes with an 18 AB?
Answer:
mm (in)