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original commit: e735e065a607fcbf8218db77ccd96efa8b56ea6c
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;; subset? : integer-set integer-set -> bool
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(define (subset? s1 s2)
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(subset?-helper (integer-set-contents s1) (integer-set-contents s1)))
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(subset?-helper (integer-set-contents s1) (integer-set-contents s2)))
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(define int (flat-named-contract "exact-integer" int?))
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(provide/contract (struct integer-set ((contents (flat-named-contract "integer-set-list" well-formed-set?))))
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