I did actual calculations (like for real) and found out the best combination for a Datu furnishings
TV, Radio, Microwave, Sofa, Curtains, and Computer
the second best combination is
Refrigerator, Radio, Microwave, Sofa, Curtains, and Computer
Avoid using these 3 furnishings since it is the least common among customers
Alarm clock, Ironing Board, and Mirror