Type of expression is ambiguous without more context

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Swift

exceptions

I'd like to iterate through the tuple in a for loop, like this:

for i in 0...4{
       if let value = element.list_of_keywords?.i, value == keyword {
         if let value = element.name{
           returnListOfCities(name: value)
         }
       }
     }

The problem is, if I put "i" variable after "element.list_of_keywords?." I get the following error:

Quote:

type of expression is ambiguous without more context

How to iterate through tuple in a for loop? I would really appreciate your help!
Down below I provide you more detailed code:

...

let miami = City(id:1, name:"Miami", description:"A place in Florida", latitude:25.7823404, longitude:-80.3695441, list_of_keywords: ("1", "2", "3", "4", "5"))

let new_orlean = City(id:2, name:"New Orlean", description:"A place in Florida", latitude:25.7823404, longitude:-80.3695441, list_of_keywords: ("6", "7", "8", "9", "10"))


let cities = [miami, new_orlean]


func returnListOfCities(name: String) {
  for element in cities {
    if let value = element.name, value == name { 
  print(value) 
    }
  }
}

func returnListOfCities(keyword: String) {
  for element in cities {
    for i in 0...4{
        if let value = element.list_of_keywords?.i, value == keyword {
          if let value = element.name{ 
            returnListOfCities(name: value)
          }
        }
      }
    }
  }

returnListOfCities(keyword: "5")

What I have tried:

I've tried putting "i" variable created from for loop, like this:

element.list_of_keywords?.i