HI I HAVE FOUND A NEW BUG IN THE HASKELL THAT IS WE HAVE HEARED THAT THE APPENDER IS OF TWO EQUAL ORDER LIST I-e [[2,3]] ++ [[2,3]] [[2,3]] ++ [[]] BUT NOW ACCORDING TO OUR ASSIGNMENT WE HAVE TO MADE THE CARTESIAN PRODUCT AND I FIND THAT IT IS ALSO WORKING IN APPENDING. from my point of view IT IS A BUG IN HASKELL ACCORDING TO MY LIMITED INFORMATION. PLZ SOLVE THIS [] ++ [[1,2]] [[2,3]] ++ [] BUT WHEN WE PUT THE FULL LIST INSTEAD OF EMPTY THEN IT GIVES THE ERROR BUT IT SHOULD BE POSSIBLE TO GIVE ERROR IN EMPTY LIST. SALAM MUHAMMED BILAL bilalnz@yahoo.com