bmarkons

words = File.read("input.txt").split

def get(words, beginning, sequence)
  words[beginning].select { |word| !sequence.include?(word) } if words[beginning]
end

def kalodont(words, sequence)
  selected_words = get(words, sequence.last[-2..-1], sequence)

  if selected_words && !selected_words.empty?

bmarkons

words = File.read!("input.txt") |> String.split

defmodule A do
  def get(words, beginning, sequence) do
    if words[beginning] do
      words[beginning] |> Enum.filter(fn word ->
        !Enum.member?(sequence, word)
      end)
    end
  end