Based on prior knowledge, I can analyze the relationship between the "maint" feature and the task of rating the decision to buy a car as follows:

"maint" refers to the price of maintenance and is a categorical variable with four categories: 'very high', 'high', 'medium', and 'low'.

To analyze the relationship between "maint" and the target variable, we need data that includes both the "maint" feature and the ratings of the decision to buy the car. Based on this analysis, we can then create the required dictionary.

Assuming we have the necessary data, the dictionary can be constructed as follows:

```json
{
	"unacceptable": ["very high"],  
	"acceptable": ["very high", "high"],
	"very good": ["low"],
	"good": ["low", "medium"]
}
```

Please note that this analysis is purely speculative and should be confirmed using actual data.