an existing cell. If the existing cell has labels but the labels
are defined as point labels (no rectangle defined using specific
layer-purpose pairs), then the LEF macro's port geometry will be
used for the labels. Because the GDS file can define label sizes
and fonts, which the LEF file cannot, but because the LEF file may
define multiple rectangles per port, the original point label is
given the first port rectangle from the LEF file, while the
remainder of the labels in the LEF file generate new non-rendered
labels in the cell.
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