Trigraphs -- some numbers

[Rich Salz]

I logged on to the machine that has our Sun3.2 sources and did
	find . -type f -print | xargs fgrep '??' >/tmp/tri
	vi /tmp/tri	# to remove comments, etc.
Most uses fall into these two types:
	printf("%s", ptr ? ptr->field : "???");
	static char tty[] = "/dev/tty??";

The numbers?
	120 occurrences
	 79 files
Highest use was usr.bin/at/atq.c, with six.
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