Code Optimization

Single correct

• AB1: $\{a, b, c, e, f\}$, B2: $\{d, e\}$, B3: $\{b, c, e, f\}$, B4: $\emptyset$
• BB1: $\emptyset$, B2: $\{d, e\}$, B3: $\{a, c, f\}$, B4: $\emptyset$
• CB1: $\{a, b, c, e, f\}$, B2: $\{d, e\}$, B3: $\{c, e, f\}$, B4: $\emptyset$
• DB1: $\emptyset$, B2: $\{d, e, f\}$, B3: $\{a, b, c, e, f\}$, B4: $\emptyset$