<s>[INST] A patient is evaluated on depression using mental health scales (M1, M2 and M3). Score on scale M1 ranges from 1-5 and increased scores corresponds to higher level of depression. Scores on other two scales, M2 and M3 range from 1-10 and higher scores are associated with lower levels of depression. M1 is show a stronger correlation with depression among these three. Considering the situation, what does "a perfect relationship" signify for this data and why?[/INST]