• This problem can be solved by pre-school children in 5-10 minutes, by programmers in 1hour, by people with higher education... well, check it yourself!

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    This problem can be solved by pre-school children in 5-10 minutes, by programer – in 1 hour, by people with higher
    education … well, check it yourself! :)
    8809=6
    7111=0
    2172=0
    6666=4
    1111=0
    3213=0
    7662=2
    9313=1
    0000=4
    2222=0
    3333=0
    5555=0
    8193=3
    8096=5
    7777=0
    9999=4
    7756=1
    6855=3
    9881=5
    5531=0
    2581=?
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