Based on my prior knowledge, the number of doors is likely to have a relationship with the decision to buy a car. 

Analyzing the possible relationships between the number of doors and the rating of the decision to buy the car:
- Cars with 2 doors might be less practical for families or people needing more space, so they could potentially be rated as "unacceptable".
- Cars with 3 doors might also be less practical, but they may have some advantages over 2-door cars. However, they could still be rated as "unacceptable" or "acceptable" depending on other factors.
- Cars with 4 doors are generally considered more practical and convenient, so they are likely to be rated as "acceptable" or even "good" depending on other factors.
- Cars with 5 or more doors, such as SUVs or minivans, are typically very practical and spacious, making them more likely to be rated as "good" or even "very good".

Based on this analysis, I will create the dictionary with the possible values of the number of doors for each rating:

```json
{
	"unacceptable": ["2", "3"],
	"acceptable": ["3", "4"],
	"good": ["4", "5more"],
	"very good": ["5more"]
}
```
Note: The values in the lists are strings, as mentioned in the task description. Some values are repeated in multiple lists where they can be associated with different ratings.