anchor.diff:            exit(overflow)
         end
     end.
  -
   
   digit(C) when C >= $0, C =< $9 -> C - $0 + 26;
   digit(C) when C >= $A, C =< $Z -> C - $A;
  
positive.code:   encode1(Rest, Output, H, B, N, Delta, Bias);
  encode1([], Output, H, _B, N, Delta, Bias) ->
    {Output, H, Delta + 1, N +1, Bias}.
  
  
  encode2(Rest, Output, H, B, N, Delta, Bias, Q, K) ->
    T = if
  
negative.code:          false -> I0 + (Digit * Weight);
           true -> exit(overflow)
         end,
    T = if
          K =< Bias -> ?TMIN;
          K >= (Bias + ?TMAX) -> ?TMAX;
  