41. The common Cipher Block Chaining ( CBC ). 42. This often serves as the basis for chaining . 43. In theory, chaining could improve the performance of common multi-step operations. 44. But daisy chaining line out-line in? 45. Both forward and backward chaining inference is available. 46. Some more extreme opponents have talked of chaining themselves to fences or holding protest marches. 47. So why aren't Americans chaining themselves to IRS offices and staging tax revolts? 48. And they quickly seized peacekeepers, chaining some to potential targets of NATO air strikes. 49. There are mainly two modes for an inference engine : forward chaining and backward chaining. 50. There are mainly two modes for an inference engine : forward chaining and backward chaining .