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Find unique values in two columns in a data frame

I am having a data frame with two columns

From    To
A           F
B           H
D           B
T            A

I need the unique items collectively considering the two columns "From" and "To". i.e the output should be one column with values

A
B
D
T
F
H
gene

What have you already tried... ?

Hello saswatimahapatra2015!

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1 answer

data.frame(unique(unlist(YOUR.DATA.FRAME)))

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