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The unic number 1 of 1 digit can be read in 1 number of 2 digits = 10, hence c(n) = 1
The 2 numbers of 2 digits 10 and 11 can be read in 1 number of 3 digits = 110, hence c(2)=1
The four numbers of 3 digits 100,101,110,111 nead 3 digits of 4 digits : e.g 1000 (100)1010(101)1110 (110 and 111); 2 numbers are not enough because 1010 for example contains only on number of 3 digits and for the second reason that 1100 and 1101 contain each the number 110
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