I am trying to solve this particular exercise from htdp(17.1.2) .I have two questions here :-<br><br>1) In the data definition of los and lon do I have to consider the empty list scenario?<br>2) The design recipe before the example explains that one list can be considered atomic but in this case requires to extract each element from the two lists make a list of that and then make a list of all the lists.So how do I go about the recursion?<br>
<br><br>Please point me in the right direction.<br><br><br>Aditya<br><br><br> <br>