[R] How to construct a double-entry with variables from a dataset

[Andrea Marcela Huerfano Barbosa]

Hi everyone,
My name is Marcela, I am bachelor student of statistics.
I have a data frame with 59 variables and two of them are categorical  and
 have three levels each one,  I would like to construct a double -entry
table with this variables, I mean the categorical ones.

Any help will be really thankful

Thanks for reading
Andrea Marcela
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