id	author	title	date	pages	extension	mime	words	sentences	flesch	summary	cache	txt
5595	Schieber, William D.; Thomas, George W.	An Algorithm for Compaction of Alphanumeric Data	1971-12-01	9	.pdf	application/pdf	3492	343	72	The second type of approach involves the replacement, by shorter nondata strings, of longer character strings known to exist with a high frequency in the data. of two data characters by single unused computer codes. most-frequently occurring digrams be replaced by single unused specialcharacter codes. are a total of 256 possible character codes (bytes ) . This requires a frequency count of all digrams appearing in the data, and character set is defined, and the digrams eligible for replacement are code for that character is moved to the output string. If the code represents a single character, point to next source byte the encoding time, the file was loaded from tape to disk. Currently the compression technique encodes only pairs of characters. to be en'coded, the algorithms for encoding and decoding become more If lower-case characters are used, a possible way to encode data using 	./cache/5595.pdf	./txt/5595.txt