IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
member append T:Type, x:T, l1,l2:T List. (xl1 @ l2) (xl1) (xl2)
By:
((Analyze 0) THEN (Analyze 0) THEN (Analyze 0)) THEN ListInd -1 THEN Reduce 0