hi, 

I am trying to implement a set multiplication program in haskell. 

Input : [1,2,3]   [4,5]  [6,7] 

Ouput : [ [1,4,6] , [1,4,7] , [1,5,6] , [1,5,7] ...] 

I implemented it for constant number of inputs like 

setMul xs ys zs =  [ [x] ++ [y] ++ [z] |  x <- xs , y<-ys ,z <- zs]

I am not able to generalize this for any number of lists. 

type signature would be :

setMulMany :: [[a]] -> [[a]]

Example : 

Input : [ [1,2,3] , [4,5] , [6,7]] 

Ouput :  [ [1,4,6] , [1,4,7] , [1,5,6] , [1,5,7] ...] 

 

Regards.