(10 . 3)(10 . 4)
xxxxxxx ffa_ch10_karatsuba             "Introducing Karatsuba's Multiplication."
xxxxxxx ffa_ch11_tuning_and_api        "Tuning and Unified API."
 551091 ffa_ch12_karatsuba_redux       "Karatsuba Redux."
 551348 ffa_w_borrow_expr diana_coman Replaces expression for calculating borrow bit with more readable version that is also symmetrical to that for carry bit.

(45 . 7)(45 . 7)
   function W_Borrow(A : in Word; B : in Word; D : in Word)
                    return WBool is
   begin
      return WBool(Shift_Right(((not A) and B) or (((not A) or B) and D),
      return WBool(Shift_Right((B and D) or ((B or D) and (not A)),
                               Bitness - 1));
   end W_Borrow;