Answer :

[tex]\{\}, \{a\}, \{e\}, \{i\}, \{o\}, \{a, e\}, \{a, i\}, \{a, o\}, \{e, i\}, \{e, o\}, \{i, o\}, \{a, e, i\},\\ \{a, e, o\}, \{a, i, o\}, \{e, i, o\}, \{a, e, i, o\}[/tex]

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