Class 'labelled' num [1:26, 1:2] 1 3 5 7 9 11 13 15 17 19 ...
   .. .. LABEL: Letters 
   .. .. VALUE LABELS [1:52]: 1=a, 2=A, 3=b, 4=B, 5=c, 6=C, 7=d, 8=D, 9=e, 10=E ... 43=v, 44=V, 45=w, 46=W, 47=x, 48=X, 49=y, 50=Y, 51=z, 52=Z 
