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  • {Mammals} ⊂ {Vertebrates}
    True
  • 3 ∊ {factors of 12}
    True
  • {metals in liquid state} = Ø
    false
  • 9 ⊂ {multiples of 3}
    False
  • Bangkok ∊ { the cites of the countries}
    True
  • {Even prime numbers} = Ø
    false
  • {Acute angles greater than 90} =Ø
    True
  • {Traingles} ∊ {triangles, rectangles, polygons}
    False
  • 49 ⊂ {1,4,9,16,25,36,49}
    False
  • {1,2,3} ⊂ {1,2,3,4,5}
    True
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