Resolvable $(10,2,1)$-design

Question

I need to construct a resolvable $(10,2,1)$-design and it's parallel classes. The design itself is easy to construct but I don't know how to construct the parallel classes. I know that since $r=9$ (number of blocks containing a given point), we have $9$ parallel classes. Using symbols $0-9$, let $\mathcal{D}$ be the resolvable $(10,2,1)$-design: $$\mathcal{D}=\{01,02,03,04,05,06,07,08,09,12,13,14,15,16,17,18,19,23,24,25,26,27,28,29,34,35,36,37,38,39,45,46,47,48,49,56,57,58,59,67,68,69,78,79,89\}$$ Can someone show me how to construct the parallel classes $\mathcal{D}_1,\mathcal{D}_2,...,\mathcal{D}_9$?