Based on prior knowledge, there could be a relationship between the duration of arterial hypertension (DLIT_AG) and the presence of chronic heart failure (target variable). Chronic heart failure is often associated with long-term hypertension.

To analyze the relationship in detail, we will examine the distribution of DLIT_AG categories among patients with and without chronic heart failure.

After analyzing the data, the dictionary will be as follows:

```json
{
    "no": ["there was no arterial hypertension", "more than 10 years", "6-10 years", "three years", "two years", "one year", "five years", "four years"],
    "yes": ["more than 10 years", "6-10 years", "three years", "two years", "one year", "four years"]
}
```

The list of possible DLIT_AG values for the "no" class includes all categories. This suggests that patients without chronic heart failure can have any duration of arterial hypertension.

On the other hand, for the "yes" class, the DLIT_AG values do not include "there was no arterial hypertension" or "five years." This indicates that patients with chronic heart failure are less likely to have never had arterial hypertension or have a duration of exactly five years.