Analysis of relationship between feature FK_STENOK and target task:

Based on prior knowledge, the functional class of angina pectoris in the last year (FK_STENOK) can provide some insights into the presence of chronic heart failure (target task). Angina pectoris is a symptom of an underlying heart condition, and the severity of angina can indicate the extent of heart failure. Therefore, it is likely that the functional class of angina pectoris may be related to the presence or absence of chronic heart failure.

To form the dictionary, we will consider the possible values of FK_STENOK and their relationship with the target task:

- For the target class "no" (no chronic heart failure), the possible values of FK_STENOK could be:
  - ['there is no angina pectoris']: It is possible that if there is no angina pectoris, the patient does not have chronic heart failure.
  - ['I FC', 'II FC', 'III FC.', 'IV FC']: The presence of any functional class of angina pectoris may suggest an increased likelihood of chronic heart failure. However, further analysis is required to determine the specific relationship between these values and chronic heart failure.

- For the target class "yes" (chronic heart failure):
  - ['I FC', 'II FC', 'III FC.', 'IV FC']: The presence of any functional class of angina pectoris could be indicative of chronic heart failure. However, it's challenging to predict the exact relationship between the specific values and chronic heart failure. Further analysis is needed to establish the significance of each value.

Based on this analysis, the dictionary will have the following format:

```json
{
	"no": ["there is no angina pectoris", "I FC", "II FC", "III FC.", "IV FC"],
	"yes": ["I FC", "II FC", "III FC.", "IV FC"]
}
```
Please note that the specific values and their relationship with chronic heart failure need further analysis to determine the significance and predictive power of FK_STENOK.