Example:
```shell
-python utxo_combiner.py -c http://127.0.0.1:9888 -a sheng -p 123456 -m 50000000 -s 20
+python utxo_combiner.py -c http://127.0.0.1:9888 -a sheng -p 123456 -m 41250000000 -s 20
```
or
```shell
- python utxo_combiner.py --connection http://127.0.0.1:9888 --account sheng --password 123456 --max_amount 50000000 --size 20
+ python utxo_combiner.py --connection http://127.0.0.1:9888 --account sheng --password 123456 --max_amount 41250000000 --size 20
```
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