Based on prior knowledge, the number of doors can be a relevant feature in determining the decision to buy a car. Different individuals may have different preferences when it comes to the number of doors in a car.

Using this knowledge, let's analyze the relationship between the number of doors and the decision to buy a car. We'll create a dictionary with the possible values of the number of doors for each target class.

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

In this analysis, we assume that cars with only 2 doors may be considered unacceptable by some individuals, while cars with 3 or more doors are generally acceptable. Cars with 4 or more doors may be considered very good, and cars with 3 or more doors are considered good.

Please note that this analysis is based on limited information and may not capture all potential relationships between the number of doors and the decision to buy a car. Additional data and analysis would be needed for a more comprehensive understanding.