Jakie są podzbiory abc id?

Podzbiory a bc i d to:

* {} (pusty zestaw)

* {A}

* {B}

* {C}

* {D}

* {a, b}

* {a, c}

* {a, d}

* {b, c}

* {b, d}

* {płyta CD}

* {a, b, c}

* {a, b, d}

* {a, c, d}

* {b, c, d}

* {a, b, c, d}