F(A,B,C,D)=B¯¯¯¯¯D+¯¯¯¯BCD+ABC+AB¯¯¯¯CD+¯¯¯¯B ¯¯¯¯¯D
F=D+(B+¯¯¯¯B)+¯¯¯¯BCD+ABC+AB¯¯¯¯CD
=¯¯¯¯¯D+¯¯¯¯BCD+ABC+AB¯¯¯¯CD
=¯¯¯¯¯D+¯¯¯¯BCD+AB(C+¯¯¯¯CD)
=¯¯¯¯¯D+¯¯¯¯BCD+AB(C+D)
=¯¯¯¯¯D+(¯¯¯¯BC+AB)+ABC
=(¯¯¯¯¯D+D)(¯¯¯¯¯D+¯¯¯¯BC+AB)+ABC
F=¯¯¯¯¯D+¯¯¯¯BC+AB