⍝ Reference to ancestor space.

    ⎕this ≡ up 0            ⍝ here is here
1
    #≡up 256                ⍝ up to top.
1
    ##≡up 1                 ⍝ parent.
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    ##.##≡## up 1           ⍝ grandparent.
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    0⍴'a.b.c.d.e'⎕ns''      ⍝ 5-deep space.

    a.b.c≡a.b.c.d.e up 2    ⍝ e's grandparent.
1

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