From Skiathos, you can reach Skopelos, Allonissos, and Skyros.
From Skiathos, you can not reach Skopelos, Allonissos or Skyros.
mnli hypothesis: From Skiathos, you can not reach Skopelos, Allonissos or Skyros. premise: From Skiathos, you can reach Skopelos, Allonissos, and Skyros.