RTs use </span><font face="Times New Roman" size="3">direction</font><span style="font-family: 'Times New Roman'; font-size: medium; line-height: normal;"> to control which assertions will be accessed during inference. Direction comes in two flavors: </span><font face="Times New Roman" size="3">forward</font><span style="font-family: 'Times New Roman'; font-size: medium; line-height: normal;"> and </span><font face="Times New Roman" size="3">backward</font><span style="font-family: 'Times New Roman'; f