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Attention, Earthling, This is a message received by the International Space Station from The Aliens Leader, They will invade planet Earth soon

Learn the letters of Aliens languages:
A ⏃ B ⏚ C ☊ D ⎅ E ⟒ F ⎎ G ☌
h ⊑ i ⟟ j ⟊ k ☍ l ⌰ m ⋔ n ⋏
O ⍜ P ⌿ Q ⍾ R ⍀ S ⌇ T ⏁ U ⎍
V ⎐ W ⍙ X ⌖ Y ⊬ Z ⋉

Are you ready to receive them?