lr=. 5!:5 @ <
     NB. "Linear. The linear representation is a string which, when 
interpreted, produces the named object."

   u=. (<('0');0)` 
   lr'u'
0`
   v=. 0`
   (<0)u
+-----+-+
|+-+-+|0|
||0|0|| |
|+-+-+| |
+-----+-+
   (<0)v
|domain error: v
|       (<0)v

   erase'v'
1
   ". 'v=.',lr'u'
   v
0`
+-+-+
|0|`|
+-+-+
0`
   (<0)v
|domain error: v
|       (<0)v
----------------------------------------------------------------------
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