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6 ∉ {7,8,9,10}
67 ∈ {natural numbers/bilangan asli}
0 ∈ {even numbers/bilangan genap}
Dog ∈ {mammal animals}
57 ∉ {prime numbers/bilangan prima}
u ∈ {vowel/huruf vokal}
1994 ∉ {leap years/tahun kabisat}
0 ∉ {natural numbers}
1 ∈ {whole numbers/bilangan bulat}