For the Bayes net structures in Figure S?? and Figure S?? that are missing a direction on their edges, assign a direction to each edge such that the Bayes net structure implies the stated conditional independences and does not imply the conditional independences stated not to hold. 

a. Constraints: 

• D ⊥⊥ G 

• not D ⊥⊥ A 

• D ⊥⊥ E 

• H ⊥⊥ F 

b. Constraints: 

• D ⊥⊥ F 

• not D ⊥⊥ G

• D ⊥⊥ E 

• Bayes net has no directed cycles