IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
cons sublist cons T:Type, x1,x2:T, L1,L2:T List.
[x1 / L1] [x2 / L2] x1 = x2 & L1L2 [x1 / L1] L2
By:
Auto THEN All (Unfold `sublist`) THEN All Reduce THEN ExRepD