(i) {a, b} ⊄ {b, c, a}

(ii) { a, e } ⊂ { x : x is a vowel in the English alphabet}

(iii) {1, 2, 3} ⊂ {1, 3, 5}

(iv) {a} ⊂ {a, b, c}

(v) {a} ∈{a, b, c}

(vi) { x : x is an even natural number less than 6} ⊂ { x : x is a natural number which divides 36}