(0*9)+1=1
(1*9)+2=11
(12*9)+3=111
(123*9)+4=1111
(1234*9)+5=11111
(12345*9)+6=111111
(123456*9)+7=1111111
(1234567*9)+8=11111111
(12345678*9)+9=111111111
(123456789*9)+10=1111111111
(1-1)/9=0
(11-2)/9=1
(111-3)/9=12
(1111-4)/9=123
(11111-5)/9=1234
(111111-6)/9=12345
(1111111-7)/9=123456
(11111111-8)/9=1234567
(111111111-9)/9=12345678
(1111111111-10)/9=123456789
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