31. T�rk Telekom started building the fibre optic substructure for IPTV in late 2007. 32. Stone buttressing, connected to this substructure , supported the south retaining wall. 33. The older, inner pyramid is referred to as the " substructure ". 34. They built portions of the substructure that the Foundation Company had not done. 35. The viaduct substructure is of reinforced concrete pier columns supported on bored piles. 36. Population genetic substructure also can aid genetic association studies. 37. Databases enabling such searching of chemical substructures are indispensable. 38. The substructure is protected against scouring using gabions placed on the river bed. 39. The bridge design is two concrete-girder spans on a concrete substructure . 40. The body ( called head on a spinnenkop ) and substructure are weatherboarded.