class TransactionSet {

    public boolean hasTransaction(Transaction transaction) {
        return this.transactionsByHash.containsKey(transaction.getHash());
    }

    public  TransactionSet();
    public  TransactionSet(TransactionSet transactionSet);
    public  TransactionSet(Map<Keccak256, Transaction> transactionsByHash, Map<UscAddress, List<Transaction>> transactionsByAddress);

}