Consider a 24 factorial experiment. Using BC as the defining contrast, find the treatment combinations in a

Question:

Consider a 24 factorial experiment. Using BC as the defining contrast, find the treatment combinations in a 24 - 1 fractional factorial experiment. Find the aliases of the contrasts. How would it be possible to estimate the effect of the contrast BC? If AD is used as a second defining contrast, determine the treatment combinations in a 24-2 fractional factorial experiment. What is the alias structure now?