Raspuns:
Se pot folosi multe numere:
1111,1222,1333,1444,1555,1666,1777,1888,1999
2111,2222,2333,2444,2555,2666,2777,2888,2999
3111,3222,3333,3444,3555,3666,3777,3888,3999
4111,4222,4333,4444,4555,4666,4777,4888,4999
5111,5222,5333,5444,555,5666,5777,5888,59999
6111,6222,6333,6444,6555,6666,6777,6888,6999
7111,7222,7333,7444,7555,7666,7777,7888,7999
8111,8222,8333,8444,8555,8666,8777,8888,8999
9111,9222,9333,9444,9555,9666,9777,9888,9999
