To analyze the relationship between the "contact" feature and the task of whether the client subscribes to a term deposit, we can calculate the percentage of clients who subscribed to a term deposit for each category of the "contact" feature. Based on this analysis, we can identify the possible values of the "contact" feature for each target class.

Here is the dictionary containing the list of possible values of the "contact" feature for each target class:

```json
{
    "no": ["unknown", "cellular", "telephone"],
    "yes": ["cellular", "telephone"]
}
```

Explanation:
- Clients who did not subscribe to a term deposit ("no" target class) have three possible values for the "contact" feature: "unknown", "cellular", and "telephone".
- Clients who subscribed to a term deposit ("yes" target class) have two possible values for the "contact" feature: "cellular" and "telephone".