Algorithm 1 Determining $r_{\mathrm{th}}$ and $r_{\mathrm{ch}}$ of a co.cs starting from chunk t with length $\varphi$.

1: if $t-\varphi +1=1$ then 2: $r_{\mathrm{ch}}=\varphi ·\mu$ 3: if r.b.s.s$\left(t\right)=$ true then 4:  $r_{\mathrm{th}}=\varphi ·\mu$ 5: else 6:  $r_{\mathrm{th}}=\varphi ·\mu -\gamma$ 7: end if 8: else 9: $r_{\mathrm{ch}}=\varphi ·\mu +\gamma$ 10: if l.b.s.s$\left(t-\varphi +1\right)=$true and r.b.s.s$\left(t\right)=$ true then 11:  $r_{\mathrm{th}}=\varphi ·\mu +\gamma$ 12: else if l.b.s.s$\left(t-\varphi +1\right)=$ true and r.b.s.s$\left(t\right)=$ false then 13:  $r_{\mathrm{th}}=\varphi ·\mu$ 14: else if l.b.s.s$\left(t-\varphi +1\right)=$ false and r.b.s.s$\left(t\right)=$ true then 15:  $r_{\mathrm{th}}=\varphi ·\mu$ 16: else if l.b.s.s$\left(t-\varphi +1\right)=$ false and r.b.s.s$\left(t\right)=$ false then 17:  $r_{\mathrm{th}}=\varphi ·\mu -\gamma$ 18: end if 19: end if