The accompanying file contains four observations with four categorical variables, x1,x2,x3, and x4.

x1	x2	x3	x4
Round	Wood	Large	With handle
Square	Metal	Small	With handle
Triangle	Metal	Small	Without handle
Round	Wood	Large	Without handle

a. Compute the matching coefficient for all pairwise observations.

b. Identify the pair of observations that are most and least similar to each other.