8809 = 6 5555 = 0
7111 = 0 8193 = 3
2172 = 0 8096 = 5
6666 = 4 1012 = 1
1111 = 0 7777 = 0
3213 = 0 9999 = 4
7662 = 2 7756 = 1
9313 = 1 6855 = 3
0000 = 4 9881 = 5
2222 = 0 5531 = 0
3333 = 0 2581 = ???
This problem can be solved by pre-school children in five to ten minutes, by pro
grammers in an hour and by people with higher education... well, check it yours
elf!
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