Class 'labelled' num [1:10] 1 2 3 4 5 6 7 8 9 10
   .. .. LABEL: Letters 
   .. .. VALUE LABELS [1:10]: 1=a, 2=b, 3=c, 4=d, 5=e, 6=f, 7=g, 8=h, 9=i, 10=j 
