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:
| model | cylinders/ valves | displacement cc | max. power kW (PS) at rpm | max. torque (Nm) at rpm | engine code | top speed (km/h) | production period |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1.4 16V | R4/16 | 1390.0 | 55 (75) / 5,000 | 126 / 3,800 | AHW / AXP / AKQ / APE / AUA / BCA | 170.0 | 1999–2004 |
| 1.6 | R4/8 | 1595.0 | 74 (101) / 5,600 | 145 / 3,800 | AKL / AEH / APF | 188.0 | 1999–2000 |
| 1.6 16V | R4/16 | 1598.0 | 77 (105) / 5,700 | 148 / 4,500 | AUS / AZD / ATN / BCB | 192.0 | 2000–2004 |
| 1.8 20V | R4/20 | 1781.0 | 92 (125) / 6,000 | 170 / 4,200 | AGN / APG | 200.0 | 1999–2003 |
| 1.8 20V T | R4/20 | 1781.0 | 132 (180) / 5,500 | 235 / 1,950–5,000 | AUQ | 229.0 | 2003–2004 |
| 2.3 V5 | VR5/10 | 2324.0 | 110 (150) / 6,000 | 205 / 3,200 | AGZ | 216.0 | 1999–2000 |
Question:
what's the cylinders/ valves with model being 1.8 20v
Answer:
R4/20