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Given a text, write a compressed version of it in a single sentence.

Each year the Postal Service conducts a City Carrier Survey (CCS) of delivered mail volume by route. Between 1993 and 1996, the Postal Service conducted the survey using a relatively small panel of about 400 routes.
Output:
Between 1993 and 1996, the Postal Service conducted the survey using a relatively small panel of about 400 routes.