Please do $9\mathrm{.}21$ and design the synchronous counter since it is part of the question. thank you

$9\mathrm{.}21$ Table $9\mathrm{.}20$ shows the count sequence for a biquinary sequence counter. The sequence

has ten states, but does not progress in binary order. The advantage of the sequence

is that its most significant bit has a divide$-$by$-10$ ratio, relative to a clock input, and

a $50\%$ duty cycle. Design the synchronous counter circuit for this sequence, using

D flip$-$flops. Hint: When making the state table, list all present states in binary order.

The next states will not be in binary order.