Based on prior knowledge, the education level of a client can be a significant factor in determining whether they subscribe to a term deposit or not. Higher education levels such as tertiary may indicate higher income or financial literacy, which could make the client more likely to subscribe to a term deposit. Conversely, lower education levels such as primary may indicate lower income or financial awareness, resulting in a lower likelihood of subscribing to a term deposit.

Here is the dictionary based on the analysis:

```json
{
    "no": ["unknown", "primary"],  
    "yes": ["tertiary", "secondary"]
}
```

In this dictionary, the target class "no" includes the education levels "unknown" and "primary" as possible values, indicating that clients with these education levels are less likely to subscribe to a term deposit. The target class "yes" includes the education levels "tertiary" and "secondary" as possible values, indicating that clients with these education levels are more likely to subscribe to a term deposit.