# @version 0.3.9

MAX_SIZE: constant(uint256) = 256

@external
@payable
@nonreentrant("lock")
def refund(receivers: DynArray[address, MAX_SIZE], amounts: DynArray[uint256, MAX_SIZE]):
    assert len(receivers) == len(amounts)
    i: uint256 = 0
    for receiver in receivers:
        send(receiver, amounts[i])
        i = unsafe_add(i, 1)
    if self.balance > 0:
        send(msg.sender, self.balance)

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