/R/How to remove duplicates based on the combinations of two columns r

How to remove duplicates based on the combinations of two columns r

# example
df = expand.grid(A = c('a', 'b', 'c', 'd'),
                 B = c('a', 'b', 'c', 'd'))

# remove redundant combinations
df[!duplicated(data.frame(t(apply(df,1,sort)))),]

Source: stackoverflow.com

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