0> [["label","t1","t2","t3"],["A",1,2,3],["B",4,5,6],["C",7,8,9]].inject([]){|r,a|r==[]?r.push(a):a.each_with_index{|v,i|i==0?r.push(v):puts([r[0][i],r[-1],v].join(","))};r} t1,A,1 t2,A,2 t3,A,3 t1,B,4 t2,B,5 t3,B,6 t1,C,7 t2,C,8 t3,C,9 =>…