How to Confuse an R Programmer #rstats #rstudio #datamanipulation

How to confuse a programmer in the R programming language. Why does this happen when you extract only one column from your data frame?
R code of this video:

df ＜- data.frame(x1 = 1:4,
x2 = letters[4:1],
x3 = 5:2)
df

df[ , c(1, 3)]

df[ , 1]

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