Based on prior knowledge, the number of doors can have an impact on how someone would rate the decision to buy a car. Here is the analysis of the relationship between the feature and the task:

- Unacceptable: It is likely that cars with 2 doors would be rated as unacceptable, as they may be considered less practical for everyday use or family transportation.
- Acceptable: Cars with 3 and 4 doors are commonly accepted as practical options. Therefore, these values of the number of doors are likely to be rated as acceptable.
- Good: Cars with 4 doors or more are often considered good choices as they provide ample space and convenience for most needs. Therefore, the values 4 and 5more are likely to be rated as good.
- Very Good: While the number of doors may not directly affect the rating of the decision to buy a car as very good, it is possible that 5more doors could be associated with high-end or luxury cars, which may lead to higher ratings.

Based on this analysis, the dictionary for the relationship between the feature "doors" and the task "decision to buy this car" can be generated as follows:

```json
{
	"unacceptable": ["2"],
	"acceptable": ["3", "4"],
	"very good": ["5more"],
	"good": ["4", "5more"]
}
```

Note: This is a hypothetical analysis based on general assumptions. If there is any specific data or context provided, the analysis may differ accordingly.