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function Main()

   ? NCombinations( 9, [from 3 to 9] )

   // and I think the above is not correct as several solutions may be impossible

return nil

function NFactorial( n )

   local nResult  := 1
   local x
   
   for x = n to 1 step -1
      nResult := nResult * x
   Next x

return nResult

function NCombinations( n, m )

return nFactorial( n ) / ( nFactorial( m ) * nFactorial ( n - m ) )