functions

a!localVariables(
  local!word: "choose",
  local!split: a!forEach(
    enumerate(len(local!word)),
    charat(local!word,fv!index)
  ),
  local!letterCount: a!forEach(
    local!split,
    {
      character: fv!item,
      count: length(wherecontains(fv!item,local!split))
    }
  ),
  union(local!letterCount,local!letterCount)
)

There may be a more efficient way to do it but this will work

You could also do the split by using "code()" which converts any string into an array of char codes.  So, char(code(local!word)) would result in the array {"c", "h"... [etc]}

Yes, code() is pretttty handy for these type of expressions.  1 ms run time with:

a!localVariables(
  local!word: code("Choose"),
  a!forEach(
    items: union(local!word,local!word),
    expression: {
      concat(char(fv!item),"-",count(wherecontains(fv!item,local!word)))
    }
  )
)

Thanks a lot..

Thanks for helping..

Thanks Mike