IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html
At:
unit chars
a:
. a | 1 
(a ~ 1)
Generated subgoal:
| 1 |
1. a :
2. a | 1
1 | a
 | 1 step |
About:
IF YOU CAN SEE THIS go to http://www.cs.cornell.edu/Info/People/sfa/Nuprl/Shared/Xindentation_hack_doc.html