You can choose two different side dishes with your lunch. You can have
Applesauce, Beans, Grapes, or Rice. Which list shows all possible
combinations of two different side dishes?
A. Ab.bg.gr.ra
b. ab.ag.ar.bg.br.gr
c. ab.ag.bg.br.gr.ga.rb.e.g.
d. aa.ab.ag.ar.bb.br.gg.gr.re
?