function setPrize(uint256 _round, uint64 _prizeIndex, uint256 _amountWETH, uint256 _amountUSDB, uint64 _numWinners)
	external
	onlyOwner
{
	require(_round >= currentRound, "ICR");
	require(_prizeIndex < maxPrizeCount, "IPC");
	depositPrize(msg.sender, _amountWETH, _amountUSDB);
	prizes[_round][_prizeIndex] = Prize(_amountWETH, _amountUSDB, _numWinners, _prizeIndex, uint64(_round));
}

function depositPrize(address _from, uint256 _amountWETH, uint256 _amountUSDB) internal {
	WETH.transferFrom(_from, address(this), _amountWETH);
	USDB.transferFrom(_from, address(this), _amountUSDB);
	emit DepositedPrizes(_amountWETH, _amountUSDB);
}
function claimPrizesForRound(uint256 roundToClaim) external {
	...
	for (uint256 i = 0; i < maxPrizeCount_; i++) {
		Prize memory prize = prizes[roundToClaim][i];
		uint256[] memory winningTicketsRoundPrize = winningTickets[roundToClaim][i];
		for (uint256 j = 0; j < winningTicketsRoundPrize.length; j++) {
			uint256 winningTicket = winningTicketsRoundPrize[j];
			if (round.ticketStart <= winningTicket && round.ticketEnd > winningTicket) {
				_claimPrize(prize, msg.sender, winningTicket);
			}
		}
	}
	...
}

function _claimPrize(Prize memory _prize, address _receiver, uint256 _winningTicket) internal {
	uint256 amountETH = _prize.amountWETH;
	uint256 amountUSDB = _prize.amountUSDB;
	WETH.transfer(_receiver, amountETH);
	USDB.transfer(_receiver, amountUSDB);
	emit ClaimedPrize(_receiver, _prize.round, _prize.prizeIndex, amountETH, amountUSDB, _winningTicket);
}
function depositPrize(address _from, uint64 _numWinners, uint256 _amountWETH, uint256 _amountUSDB) internal {
	WETH.transferFrom(_from, address(this), _amountWETH * _numWinners);
	USDB.transferFrom(_from, address(this), _amountUSDB * _numWinners);
	emit DepositedPrizes(_numWinners, _amountWETH, _amountUSDB);
}
