7. The method of claim 3 , further comprising: weighting, by the computing device, the respective physical cost values differently than the respective lexical cost values.
8. The method of claim 7 , further comprising: in response to determining that the physical cost values satisfy one or more thresholds, weighting the lexical cost values with a first weighting value, and weighting the physical cost values with a second weighting value, wherein the first weighting value is greater than the second weighting value.