Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| School | Location | Mascot | County | Enrollment IHSAA Class | Joined | Previous Conference |
| --- | --- | --- | --- | --- | --- | --- |
| Elkhart Central * | Elkhart | Blue Blazers | 20 Elkhart | 1747 AAAA | 1927.0 | Independents |
| Mishawaka | Mishawaka | Cavemen | 71 St. Joseph | 1761 AAAA | 1927.0 | Independents |
| Mishawaka Marian | Mishawaka | Knights | 71 St. Joseph | 768 AAA | 2005.0 | Independents |
| Penn | Mishawaka | Kingsmen | 71 St. Joseph | 3222 AAAA | 1977.0 | Independents |
| South Bend Adams | South Bend | Eagles | 71 St. Joseph | 1773 AAAA | 1941.0 | none (new school) |
| South Bend Clay | South Bend | Colonials | 71 St. Joseph | 1466 AAAA | 1979.0 | Independents |
| South Bend Riley | South Bend | Wildcats | 71 St. Joseph | 1511 AAAA | 1931.0 | none (new school) |
| South Bend St. Joseph's | South Bend | Indians | 71 St. Joseph | 793 AAA | 2005.0 | Independents |
| South Bend Washington | South Bend | Panthers | 71 St. Joseph | 1428 AAAA | 1938.0 | none (new school) |
Question:
Which previous conference is associated with Penn school?
Answer:
Independents