According to the Postal Service's costing systems, the per-piece cost of basic mail in 1996 was 26.
The per-piece cost of basic mail in 1996 was 26, the same as it was in 1992.
mnli hypothesis: The per-piece cost of basic mail in 1996 was 26, the same as it was in 1992. premise: According to the Postal Service's costing systems, the per-piece cost of basic mail in 1996 was 26.