[R] Interaction of a dynamic number of factors

[Nigel Birney]

Hi, I have a dynamic table structure consisting of N factors (e.g. columns
Factor_1, Factor_2,..Factor_N). 

I want to construct a table that has as rows the level combinations of
factors F_1..F_n-1, and as columns the levels of the factor Fn. The cells of
the table would contain the number of cases that correspond to these level
combinations. How can I do this?

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