davidinga

func get_all_shortest_transformation_sequences(start_word: String, target_word: String, words: [String]) -> [[String]] {
    var result: [[String]] = []
    var found = false
    var level = 0
    let words = Set(words)
    var slate: [String] = []
    var parent: [String: Set<String>] = [:]
    var visited: Set<String> = []
    var levels: [String: Int] = [:]