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Pay for a year's delivery of, say, 11 letters
Someone who expresses strong approval, 10 letters
Someone who contracts to receive and pay for a certain number of issues of a publication, 10 letters
Someone who contributes (or promises to contribute) a sum of money, 10 letters
Agreement expressed by (or as if expressed by) signing your name, 12 letters
Writing your signature (as on a document), 12 letters
A pledged contribution, 12 letters
A payment for consecutive issues of a newspaper or magazine for a given period of time, 12 letters