+ import std.math;
  import std.typecons;
- import std.math;
  /*
  The Brazilian factorial is defined as:
-     brazilian_factorial(n) = n! * (n-1)! * (n-2)! * ... * 1!
? ----

+ brazilian_factorial(n) = n! * (n-1)! * (n-2)! * ... * 1!
-     where n > 0
? ----

+ where n > 0
- 
-     For example:
? ----

+ For example:
-     >>> special_factorial(4L)
? ----

+ >>> special_factorial(4L)
+ 288L
-     288L
- 
-     The function will receive an integer as input and should return the special
? ----

+ The function will receive an integer as input and should return the special
-     factorial of this integer.
? ----

+ factorial of this integer.
-     
  */
  long special_factorial(long n)