Task

(Given an equal-probability generator of one of the integers 1 to 5
as dice5),   create dice7 that generates a pseudo-random integer from
1 to 7 in equal probability using only dice5 as a source of random
numbers,   and check the distribution for at least one million calls using the function created in   Simple Random Distribution Checker.


Implementation suggestion:
dice7 might call dice5 twice, re-call if four of the 25
combinations are given, otherwise split the other 21 combinations
into 7 groups of three, and return the group index from the rolls.

(Task adapted from an answer here)

dice5()
{  Random, v, 1, 5
   Return, v
}
 
dice7()
{  Loop
   {  v := 5 * dice5() + dice5() - 6
      IfLess v, 21, Return, (v // 3) + 1
   }
}