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x i. y  x⍳y
 
APL\360 definition:
  +/*./\x~:/y+⌿∧⍀x∘.≠y
 
Extended definition:
  +/*./\x~:/&:<"(_1+#$x)y +⌿∧⍀(⊂⍤¯1⊢x)∘.≢⊂⍤(¯1+≢⍴x)⊢y
 
Related functions:
  •  membership
  •  nub (unique)
  •  nub sieve
  •  tally nub
  •  key operator
  •  etc.