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113/**
114 * @notice This method is the vrf callback function. Gelato will respond with our random word by calling this method.
115 * @dev    Only executable by the vrf coordinator contract.
116 *         Will respond to the requesting basket with the random number.
117 * @param _requestId unique request identifier given to us by Gelato.
118 * @param _randomness array of random numbers requested via makeRequestForRandomWords.
119 */
120function _fulfillRandomness(uint256 _randomness, uint256 _requestId, bytes memory) internal override {
121    address basket = requestTracker[_requestId];
122    // respond to the basket contract requesting entropy with it's random number.
123    IBasket(basket).fulfillRandomSeed(_randomness);
124
125    delete requestTracker[_requestId];
126    delete outstandingRequest[basket];
127    
128    emit RequestFulfilled(_requestId, basket);
129}