| 7!:0 y | Current. Space currently in use. | 
|  | 
| 7!:2 y | Execute. Space required to execute sentence y.   
For example: 
 
   7!:2 ',/x' [ x=: 3000 2 5$'kerygmatic'
33888
 | 
| 7!:3 y | Free Space. Information on the state of the J 
memory manager, currently a 2-column table of the block sizes 
and number of free blocks for each size.  For example: 
 
   7!:3 ''
   32  950
   64 1135
  128  554
  256  157
  512   74
 1024   40
The definition and availability of 7!:3 
are subject to change. 
 
 | 
| 7!:5 y | Space. The space in bytes used by the named 
objects y (noun, verb, adverb, or conjunction).
For example: 
 
   Hilbert=: % @: >: @: (+/~) @: i.
   7!:5 <'Hilbert'
896
   7!:5 <'name_without_value'
|value error: name_without_value
|       7!:5<'name_without_value'
   sp=: 3 : '7!:5 <''y'''
   sp 'chiaroscuro'
64
   sp i.1000
4096
   sp o.i.1000
8192
   x=: o.y=: i.1000
   7!:5 ;:'x y Hilbert'
8192 4096 896
 | 
| 7!:6 y | Locale Space. The space in bytes used by the locales 
named in y , including the space for the names as well as values in the locale,
locale name, path, hash table, and global symbol table entries.
For example: 
 
   7!:6 ;:'base z 0'
8256 198880 2168
   7!:6 <'12345'
|locale error
|       7!:6<'12345'
   7!:6 <'nonexistent'
|locale error
|       7!:6<'nonexistent'
 |