Iteration in for loop

New to Julia
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Where the square brackets are - a more complete example

julia> files = ["File $i" for i ∈ 1:3]
3-element Vector{String}:
 "File 1"
 "File 2"
 "File 3"

julia> for f ∈ files
           for i ∈ 1:5
               println("Working on file $f, iteration number $i")
           end
       end
Working on file File 1, iteration number 1
Working on file File 1, iteration number 2
Working on file File 1, iteration number 3
Working on file File 1, iteration number 4
Working on file File 1, iteration number 5
Working on file File 2, iteration number 1
Working on file File 2, iteration number 2
Working on file File 2, iteration number 3
Working on file File 2, iteration number 4
Working on file File 2, iteration number 5
Working on file File 3, iteration number 1
Working on file File 3, iteration number 2
Working on file File 3, iteration number 3
Working on file File 3, iteration number 4
Working on file File 3, iteration number 5
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