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{⊃{(⊃⍵~⍳⊃⍺),⊃⌽⍺∩⍳⊃⌽⍵}/⍸¨⍺=⊂⍵}⍸¨⎕=⊂⎕
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prompts for the array and then for var1,var2
{⊃{(⊃⍵~⍳⊃⍺),⊃⌽⍺∩⍳⊃⌽⍵}/⍸¨⍺=⊂⍵}
Try it online!
⊃{(⊃⍵~⍳⊃⍺),⊃⌽⍺∩⍳⊃⌽⍵}/⍸¨⎕=⊂⎕
