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55for (uint256 i = 0; i < _bundle.offerIds.length; i++) {
56    uint256 offerId = _bundle.offerIds[i];
57
58    // Calculate bundle offers total quantity available.
59    offersTotalQuantityAvailable = calculateOffersTotalQuantity(offersTotalQuantityAvailable, offerId);
60
61    (bool bundleByOfferExists, ) = fetchBundleIdByOffer(offerId);
62    require(!bundleByOfferExists, BUNDLE_OFFER_MUST_BE_UNIQUE);
63
64    (bool exchangeIdsForOfferExists, ) = getExchangeIdsByOffer(offerId);
65    // make sure exchange does not already exist for this offer id.
66    require(!exchangeIdsForOfferExists, EXCHANGE_FOR_OFFER_EXISTS);
67
68    // Add to bundleIdByOffer mapping
69    protocolLookups().bundleIdByOffer[offerId] = bundleId;
70}
71
72for (uint256 i = 0; i < _bundle.twinIds.length; i++) {
73    uint256 twinId = _bundle.twinIds[i];
74
75    // A twin can't belong to multiple bundles
76    (bool bundleForTwinExist, ) = fetchBundleIdByTwin(twinId);
77    require(!bundleForTwinExist, BUNDLE_TWIN_MUST_BE_UNIQUE);
78
79    if (_bundle.offerIds.length > 0) {
80        bundleSupplyChecks(offersTotalQuantityAvailable, twinId);
81    }
82
83    // Push to bundleIdsByTwin mapping
84    protocolLookups().bundleIdByTwin[_bundle.twinIds[i]] = bundleId;
85}