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Substract Digits

 21         22          23           24         25        26       27 
-17        -17         -17          -17        -17       -17      -17
-----     ------      -----        -----       ----      ----     ----

-----     ------      -----        -----       -----     ----     ----


 28        29          30           31         32        33       34 
-17       -17         -17          -17        -17       -17      -17
-----    ------      -----        -----       ----      ----     ----

-----    ------      -----        -----       -----     ----     ----


 34        35          36           37         38        39       40 
-17       -17         -17          -17        -17       -17      -17
-----    ------      -----        -----       ----      ----     ----

-----    ------      -----        -----       -----     ----     ----


 41        42          43           44         45        46       47 
-17       -17         -17          -17        -17       -17      -17
-----    ------      -----        -----       ----      ----     ----

-----    ------      -----        -----       -----     ----     ----


 48        49          50           60         70        80       90 
-17       -17         -17          -17        -17       -17      -17
-----    ------      -----        -----       ----      ----     ----

-----    ------      -----        -----       -----     ----     ----



 51        52          53           54         55        56       57 
-17       -17         -17          -17        -17       -17      -17
-----    ------      -----        -----       ----      ----     ----

-----    ------      -----        -----       -----     ----     ----

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