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diff --git a/usr.bin/learn/lib/C/L5.1d b/usr.bin/learn/lib/C/L5.1d
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+++ b/usr.bin/learn/lib/C/L5.1d
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+#print
+Write a program that counts the blanks, tabs, and newlines
+in its input, and prints the total.  Don't forget to
+define the value of EOF at the beginning of your program.
+The best way is to add
+
+ #include <stdio.h>
+
+as the first line of your program.
+The must____ be in column 1.
+(See page 143 of the C book.)
+You may also have to say
+
+cc name.c -lS
+
+to compile the program.
+#once #create Ref
+This is some junk that
+contains
+	blanks
+	tabs
+	and newlines.
+#user
+a.out <Ref >test1
+a.out </dev/null >test2
+grep 13 test1 >/dev/null && grep 0 test2 >/dev/null
+#succeed
+One possible solution:
+
+ #include <stdio.h>
+
+main()
+{
+	int n, c;
+
+	n = 0;
+	while ((c = getchar()) != EOF)
+		if (c == ' ' || c == '\t' || c == '\n')
+			n++;
+	printf("%d\n", n);
+}
+
+This program won't work on huge files, because an int
+isn't big enough.
+#log
+#next
+5.1e 10
+5.2e 5