# \donttest{
library(sf)
nc1 <- system.file("shape/nc.shp", package="sf")
nc2 <- system.file("shape/nc.shp", package="sf")
nc1 <- st_read(nc1, stringsAsFactors = FALSE)
nc2 <- st_read(nc2, stringsAsFactors = FALSE)
d1 <- data.frame(nc1)
d2 <- data.frame(nc2)
preprocLinkageDBF(d1, d2, var='area')
# }
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