IF YOU CAN SEE THIS go to /sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
swap cons222122 1. T : Type
2. L : T List
3. x : T 4. i : {1..(||L||+1)}
5. j : {1..(||L||+1)}
6. i1 : 7. i1<||[x / L]||
8. i1 = 0
9. n : ||L||
10. (i-1, j-1)(i1-1) = n [x / L][(n+1)] = L[n]