What is the number of order-2 and order-3 contexts for an alphabet of size 
= 256? Explain the numbers 1/11 and 10/20. Order 0 consists of the five different symbols asnim seen in the input string, followed by an escape, which is assigned frequency 5. Thus, probabilities range from 4/19 (for a) to 5/19 (for the escape symbol).
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