| (subclass Correspondence Document) | Media.kif 952-952 | Correspondence is a subclass of document |
| (subclass Letter Correspondence) | Media.kif 953-953 | Letter is a subclass of correspondence |
| (subclass FaxMessage Correspondence) | Media.kif 1010-1010 | Fax message is a subclass of correspondence |
| (subclass EmailMessage Correspondence) | Media.kif 1028-1028 | Email message is a subclass of correspondence |
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