⍝ Vector of sub-space references:

    {}'x.x' 'x.y' 'x.z'⎕ns¨⊂''      ⍝ make some spaces.
    x.(x y z).(x y z)←⊂x.(x y z)    ⍝ make some cycles.
    
    x x.x x.y x.z≡refs x
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