Based on my prior knowledge, angina pectoris can be a symptom of chronic heart failure. Therefore, it is likely that a functional class of angina pectoris in the last year (FK_STENOK) may have a relationship with the presence of chronic heart failure (target variable).

Here is a dictionary representing the possible values of FK_STENOK for each target class:

```json
{
	"no": ["there is no angina pectoris"],
	"yes": ["II FC", "IV FC", "I FC", "III FC."]
}
```

The target class "no" includes patients who do not have chronic heart failure. In this case, the only possible value for FK_STENOK is "there is no angina pectoris". 

The target class "yes" includes patients who have chronic heart failure. For this target class, the possible values of FK_STENOK are "II FC", "IV FC", "I FC", and "III FC.".