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If a component has multiple slots in a physical package (such as a 7400 (NAND) which has 4 NANDs per package) then you need a numslots=# attribute. The # is the number of slots that are in a physical device. numslots=# should exist somewhere in the symbol and be made invisible. This is a free standing or floating attribute. If the symbol does not need slotting, then put numslots=0 into the symbol file.
Example:
numslots=4