Ok I am working with r and we are doing a discussion on die rolling. That is easy but I am not sure if I am correct about the second part

2. In rolling two normal die (1:6), there are 11 unique sums of the two die with values from 2 through 12. List the unique sums of rolling a six-sided die with a four-sided die.

I wouldn't think there would be unique sums of a six and four because all of those same sums are covered by six and six. If there are unique sums how do i find them using R?