Here's HI-3  from HI-9 in eighteen steps:

 
 
 

               1. CCpqCCqCCrpsCtCps                                                  [HI-9]
     D1.1   =  2. CCCCpCCqrsCtCrsCCuCrpvCwCCrpv
     D1.2   =  3. CCCpCCqrsCCtCCCrCCuqvCwCqvCCxCqrsyCzCCCCrCCuqvCwCqvCCxCqrsy
     D2.2   =  4. CpCCqCrCCstuCCtrCqCtu
     D3.2   =  5. CpCCCCCqrCCstuCvCtuCCwCtCqrxCCqrx
     D1.4   =  6. CCCCpCqCCrstCCsqCpCstCCuvwCxCvw
     D4.1   =  7. CCpCqCCrstCCsqCpCst
     D2.5   =  8. CpCCCqCrCstuCCstu
     D2.8   =  9. CpCCqrCCstCqr
     D7.8   = 10. CCpCCqCrCsptCuCpt
     D6.9   = 11. CpCqCCrsCtq
     D10.10 = 12. CpCCqCCrCsCtquCqu
     D7.11  = 13. CCpqCrCpCsq
     D12.1  = 14. CCpCCqCrCsptCpt
     D14.13 = 15. CCpqCpCrq
     D7.15  = 16. CCpqCCqrCpr                                                               [Syl]
     D16.1  = 17. CCCCpCCqrsCtCrsuCCrpu
     D1.16  = 18. CCCCpqCrqCCsCrptCuCCrpt
     D17.18 = 19. CCpCqrCsCCCtpqCpr                                             [HI-3]

 
Dolph Ulrich, 2007