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| 0001193125-12-230165.txt | 2012-05-14 11:00:00 | |
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| d334970d10q.htm | 251587 | 2012-05-14 11:00:00 |
| d334970dex311.htm | 9611 | 2012-05-14 11:00:00 |
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| d334970dex321.htm | 3997 | 2012-05-14 11:00:00 |
| FilingSummary.xml | 7639 | 2012-05-14 11:00:00 |
| Financial_Report.xls | 112439 | 2012-05-14 11:00:00 |
| pwx-20120331.xml | 116030 | 2012-05-14 11:00:00 |
| pwx-20120331.xsd | 10029 | 2012-05-14 11:00:00 |
| pwx-20120331_cal.xml | 31885 | 2012-05-14 11:00:00 |
| pwx-20120331_lab.xml | 108922 | 2012-05-14 11:00:00 |
| pwx-20120331_pre.xml | 65557 | 2012-05-14 11:00:00 |
| R1.htm | 26738 | 2012-05-14 11:00:00 |
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| R11.htm | 31691 | 2012-05-14 11:00:00 |
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| R13.htm | 12337 | 2012-05-14 11:00:00 |
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