df1 <- data.frame(x=c(1,2,3,NA,4), y=c(5,8,9,10,11), row.names=c("A", "B", "C", "D", "E"))
df2 <- data.frame(w=c(7,8,0,9,10), z=c(6,NA,NA,9,10), row.names=c("A", "B", "F", "C", "D"))
cbind_expand(df1, df2)
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