Based on prior knowledge, we can hypothesize that the functional class of angina pectoris (FK_STENOK) may have a relationship with the presence or absence of chronic heart failure. 

To analyze this relationship, we can examine the distribution of FK_STENOK values for each target class (chronic heart failure - yes or no). 

Here is the analysis:

For chronic heart failure - Yes:
- FK_STENOK values: ['I FC', 'II FC', 'III FC.']
- Explanation: The patient may have experienced angina pectoris in the last year, with functional classes ranging from mild (I FC) to moderate (II FC) and possibly severe (III FC).

For chronic heart failure - No:
- FK_STENOK values: ['there is no angina pectoris']
- Explanation: The patient did not experience angina pectoris in the last year.

Based on this analysis, we can create the following dictionary:

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

Please note that we are excluding the FK_STENOK value 'IV FC' as it is not clear whether it relates to chronic heart failure or not.