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diff --git a/leetcode/lc-1207-unique-occurences.rkt b/leetcode/lc-1207-unique-occurences.rkt
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-#lang racket
-(define/contract (unique-occurrences arr)
- (-> (listof exact-integer?) boolean?)
- (define occurrences (make-hash))
- (for ([n (in-list arr)])
- (hash-update! occurrences n add1 1))
- (equal? (hash-values occurrences)
- (remove-duplicates (hash-values occurrences))))
-
-(unique-occurrences '(1 2 2 1 1 3)) \ No newline at end of file