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:
| Choke | Constriction (Inch) | Percentage of lead shot in 30-inch circle at 40 yards | Identification (Notches) | Identification (Stars)\n(Spanish shotguns) |
| --- | --- | --- | --- | --- |
| Cylinder | 0.000 | 40 at 40 yd\n70 at 25 yd | IIIII notches | ***** stars |
| Skeet 1 | 0.005 | 45 at 40 yd\n75 at 25 yd |  |  |
| Improved  Cylinder | 0.010 | 50 | IIII notches | **** stars |
| Skeet 2 (light Mod.) | 0.015 | 55 |  |  |
| Modified | 0.020 | 60 | III notches | *** stars |
| Improved Modified | 0.025 | 65 | II notches | ** stars |
| Full | 0.030 | 70 | I notch | * star |
| Extra Full | 0.040 | 73 | I notch |  |
| Turkey | 0.045 plus | 75 plus | I notch |  |
Question:
how many different chokes are there that start with an s
Answer:
2