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Take the buffer for example, (Usage of Inverter and Delay cell are the same)
You can use
1) cell name, such as BUFX1, BUFX2, BUFX3... or
2) footprint name, like "BUF" in your .lib files.
Example of content of .lib file:
----------------------------------
cell(BUFX1)
cell(BUFX2)
cell(BUFX3)
:
cell_footprint : BUF ; <-- Footprint of cell: BUFX1,BUFX2,BUFX3, ...and so on.
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