// *** before: ***
let numbers1: [String: [Character]] = [
    "one": ["o", "n", "e"],
    "two": ["t", "w", "o"]
]

// *** in version 5.6: ***
let numbers2: [_: [Character]] = [
    "one": ["o", "n", "e"],
    "two": ["t", "w", "o"]
]

print("numbers1 is \(numbers1)")
print("numbers2 is \(numbers2)")