⍝ Share arrays across space tree:

    ⎕io←1

    k←{,∘'KB'⍕⌊0.5+⍵÷2*10}          ⍝ approx KB.

    nest←⍳¨∘⍳¨∘⍳¨∘⍳¨∘⍳              ⍝ nesting function.

    nested←nest 3 3                 ⍝ complex nested array.

:If 32={2×⎕size'⍵'}⍬                ⍝ 32-bit interpreter:

        k ⎕size'nested'             ⍝ size in KB.
    19KB
        k nspack ⎕this              ⍝ nspack recovers most of the space.
    18KB
        k nspack ⎕this              ⍝ subsequent pack saves no more space.
    0KB
        k ⎕size'nested'             ⍝ size _appears_ not to have changed.
    19KB
        (x←⎕ns'').(a b c←⎕ns¨3/⊂'') ⍝ make space and three subspaces.

        x.(a b c).var←nest¨3/⊂3 3   ⍝ populate subspaces separately.

        k∘nspack¨x.(a b c)          ⍝ packing _within_ spaces saves 18k each.
    ┌────┬────┬────┐
    │18KB│18KB│18KB│
    └────┴────┴────┘
        k nspack x                  ⍝ packing _among_ spaces saves further 3K.
    3KB
:Else                               ⍝ 64-bit interpreter:
        k ⎕size'nested'             ⍝ size in KB.
    38KB
        k nspack ⎕this              ⍝ nspack recovers most of the space.
    35KB
        k nspack ⎕this              ⍝ subsequent pack saves no more space.
    0KB
        k ⎕size'nested'             ⍝ size _appears_ not to have changed.
    38KB
        (x←⎕ns'').(a b c←⎕ns¨3/⊂'') ⍝ make space and three subspaces.

        x.(a b c).var←nest¨3/⊂3 3   ⍝ populate subspaces separately.

        k∘nspack¨x.(a b c)          ⍝ packing _within_ spaces saves 18k each.
┌────┬────┬────┐
│35KB│35KB│35KB│
└────┴────┴────┘
        k nspack x                  ⍝ packing _among_ spaces saves further 6K.
    6KB
:EndIf

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