[detailed write-up on github](https://github.com/shellc0d3/CTFwriteups/tree/master/ijctf2020/vault)
```python
#!/usr/bin/python2
import random

num_list = []
num_list.append(['0', '1'])
num_list.append(['4', '5', '6'])
num_list.append(['5', '6', '7', '8', '9'])
num_list.append(['1', '2', '3', '4'])
num_list.append(['0', '1', '2', '5', '8', '9'])
num_list.append(['0', '1'])

for l in num_list:
code = ''
for i in range(2000):
code += random.choice(l)
print code
```