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| 0000859598-20-000035-index.html | 2020-04-28 17:18:23 | |
| 0000859598-20-000035.txt | 2020-04-28 17:18:23 | |
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| ckh-03312020xex311.htm | 13206 | 2020-04-28 17:18:23 |
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| ckh-20200331.htm | 2729188 | 2020-04-28 17:18:23 |
| ckh-20200331.xsd | 53858 | 2020-04-28 17:18:23 |
| ckh-20200331_cal.xml | 92844 | 2020-04-28 17:18:23 |
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| ckh-20200331_lab.xml | 633942 | 2020-04-28 17:18:23 |
| ckh-20200331_pre.xml | 407420 | 2020-04-28 17:18:23 |
| FilingSummary.xml | 35207 | 2020-04-28 17:18:23 |
| Financial_Report.xlsx | 83362 | 2020-04-28 17:18:23 |
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| report.css | 2767 | 2020-04-28 17:18:23 |
| Show.js | 1085 | 2020-04-28 17:18:23 |