* @param hmmNode the unit node
* @return the search state
*/
SearchStateArc createUnitStateArc(HMMNode hmmNode, LexTreeState previous) {
SearchStateArc arc;
// System.out.println("CUSA " + hmmNode);
float insertionProbability = calculateInsertionProbability(hmmNode);
float smearProbability = getUnigramSmear(hmmNode)
+ previous.getSmearTerm();
float languageProbability = smearProbability - previous.getSmearProb();