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ngettext <msg-singular> <msg-plural> <n>procedure
(format #t (ngettext "~D file removed" "~D files removed" n) n)

In the case of English (or if no translation is found), this applies the familiar logic of using the first string (singular) if N is 1, and the second string (plural) otherwise. Not all languages have two plural forms, however, and the NGETTEXT interface allows you to write message files with the proper inflections for any language and any value of N. The exact details of how to write a message file is beyond the scope of this document - see the GNU gettext documentation.