guitunes % transf1
coll1:   1 2 3 4 5 6 7 8 9
negated: -1 -2 -3 -4 -5 -6 -7 -8 -9
coll2:   -10 -20 -30 -40 -50 -60 -70 -80 -90
90 80 70 60 50 40 30 20 10
guitunes %
