how could I calculate frequency in 3 different text?

Could you help me how to calculate frequency in the text

I could do it if I have 1 text

words is my first tex name which split

[w_u, idx, idxU]=unique(words) ;
 counts=accumarray(idxU, 1) ;
 [~, idxS]=sort(counts, 'descend') ;
 words_us = words_u(idxS) ;
 counts_s =counts(idxS) ;
 result=[words_us, num2cell(counts_s)]

but if I have 3 different text how to compair and find the same words like

word text1 text2 text3

and 5 6 7

the 5 4 5

or 4 3 5

...

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Essential duplicate: https://www.mathworks.com/matlabcentral/answers/435210-how-to-calculate-frequency-in-3-different-text