Nothing
library(gtools)
df1 <- data.frame(a=1, b=2, d=TRUE )
df2 <- data.frame( b=7, c="YES", d=FALSE)
df3 <- data.frame( b=7, c="YES" )
smartbind( df1, df2, df3 )
smartbind( df1=df1, df2, df3=df3 )
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