| http://www.w3.org/ns/prov#value | - Bulk mail is also often sent to companies' existing subscriber bases, advertising new products or services.There are a number of other things almost without any exception sent exclusively as letters through postal services, like wedding invitations.[edit] First-classFirst-class mail in the U.S. includes postcards, letters, large envelopes (flats) and small packages, providing each piece weighs 13
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