can someone please help me understand this decision tree? thank you.

. Consider the problem of finding the median of five numbers (a, b, c, d, e, solely by making comparisons between them. Assume that three of these five numbers are the same. Determine the smallest number of comparisons required in ANY case, where case refers to some order that they may appear in an input list. Draw the associated decision tree. (5 points) a:b c:d