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+#print
+The "cat" command can also print several files
+at once. In fact, it is named "cat" as an abbreviation
+for "concatenate". To print the files named "dog"
+and "mouse" in succession, you could either
+type:
+ cat dog
+ cat mouse
+or just
+ cat dog mouse
+If you print them with one command,
+the files are listed in sequence with nothing
+between them.
+
+This directory contains two files
+named "chester" and "charley". What is the
+longest word in either file? Type "answer WORD"
+where WORD is the longest word you find.
+#create charley
+most of this file is short but at one place
+there is a surprisingly long word.
+#create chester
+and of the but here now stop go
+#copyin
+#user
+#uncopyin
+#match surprisingly
+#log
+#next
+4.1a 10
+4.2a 5
+4.3a 2