IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
hcons def121 1. 'a : S
2. h : 'a 3. t : hlist('a)
<n:. if n<||t||+1 then cons(h; t)[n] else arb('a) fi ,||t||+1>
=
<m:. if m = 0 then h else 1of(rep_list('a;t))(pre(m)) fi
,2of(rep_list('a;t))+1>
('a)