how could I calculate frequency in 3 different text?

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Dezdi
Dezdi 2018-12-11
评论： Star Strider 2018-12-11
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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