Incorrect binary value

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On the following page: https://people.ksp.sk/~kuko/gnarley-trees/?page_id=310 There is an example of a binary representation of a binomial heap within the second bullet point. The example states that ( 11 (decimal) = 1101 (binary) ). This is incorrect. The correct value for 11 (decimal) is 1011(binary). Thank you for your time. Take care.