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beta_cache.get((currIndex,currState)) != None: return beta_cache[(currIndex,currState)] if currIndex == 0: currIndex = len(textList) if pos == currIndex - 1: return 1 total = 0 for state_val in states: tempSum = beta(pos,state,textList,currIndex-1,state_val,cachedRecursion) total += tempSum # if