# 9-1 Adding rows using rbind()

# Create dataframe df1

df1<-data.frame(block=c(1,2), code=c("A","B"))

# Create dataframe df2

df2<-data.frame(block=c(3,4), code=c("C","D"))

# Extend dataframe using rbind

df<-rbind(df1,df2)

# Display extended dataframe

df