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Write 1-line models of the extended ∊ ~ ∩ ∪ in terms of the extended ⍳ .




























 member    ← {(≢⍵)>⍵⍳⍺}

 unique    ← {⍵ ⌿⍨ (⍳≢⍵)=⍵⍳⍵}
                           
 without   ← {⍺ ⌿⍨ ~(⍺⍳⍺)∊,⍺⍳⍵}

 intersect ← {⍺ ⌿⍨  (⍺⍳⍺)∊,⍺⍳⍵}

 union     ← {⍺⍪(↑,⊂⍤(¯1+⍴⍴⍺)⊢⍵) without ⍺}