csv - In Google Sheets, how do I separate comma separated values? -

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i have column of comma separated values so: 

              1   a, b, c, d, e 2   a, d, e, f, g 3   b, e, f, h 4   a, b, c, d, e, f, g, h 5   d 6   f, g 7   a, e, f, g [...]

i want of these values, separately, end list/array values ["a","b","c","d","e","a","d","e","f","g","b","e"…] can pass arrayformula() nested inside function.

brownie points:
need pass =mode(). if there easier/actually possible way without =mode(arrayformula(seperate(a1:a7))), seperate being hypothetical function defined above, please give me one. thank you!

to mode, put first formula in column b. adds comma end of each set of letters split work. second formula find mode. can hide column b.

 =transpose(split(join(" ",arrayformula(a1:a7&",")),", ")) 
 =arrayformula(    index(b1:b,      match(        max(if(b1:b="",iferror(1/0),countif(b1:b,b1:b))),        countif(b1:b,b1:b),        0      )    )  )

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