make this sound less redundant: The ANOVA was supplemented with a Tukey test to compare the mean scores between all possible pairs of groups. In this case, six comparisons were made: third vs. fourth, third vs. fifth, third vs. sixth, fourth vs. fifth, fourth vs. sixth, and fifth vs. sixth grades. These grades were represented by teachers A, B, C, and D, and the comparison was based on their students' ELA MAAP scores