import BTL learn(1) lessons/files

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+#print
+Not only may the ? appear anywhere in a name,
+but there may be several ? characters in it.
+For example,
+  g??rge
+will match "george" and "goerge", among others.
+And "a??" will match "abc" or "a11" (but NOT "ax").
+Look at the files in the current directory and decide
+how many names the pattern
+   a?b?c
+will select.  Again, you can try this out
+by comparing an ordinary "ls" with "ls a?b?c"
+to see what happens.  When you figure
+out how many names are selected,
+type "answer N" where N is the number of file names.
+#create a0b0c
+#create a0bc
+#create a0x0c
+#create a1bxc
+#create aabbc
+#create azbzcz
+#copyin
+#user
+#uncopyin
+#match 3
+#log
+#next
+6.1a 5
+6.2a 2