Based on prior knowledge, we can analyze the relationship between the feature "O_L_POST" and the presence of chronic heart failure.

If the feature value of "O_L_POST" is "no", it indicates that the patient did not have pulmonary edema at the time of admission to the intensive care unit. This does not provide strong evidence for the presence of chronic heart failure.

If the feature value of "O_L_POST" is "yes", it indicates that the patient had pulmonary edema at the time of admission. Pulmonary edema can be a potential complication of chronic heart failure, so this provides some evidence for the presence of chronic heart failure. However, it is important to note that not all patients with pulmonary edema will necessarily have chronic heart failure.

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

```json
{
	"no": ["no"],
	"yes": ["yes"]
}
```

In this case, the feature value of "O_L_POST" is either "no" or "yes". We include both of these values in the dictionary for the respective target classes, even though the presence of chronic heart failure cannot be definitively determined based solely on the value of "O_L_POST".