[tuatoru]

0, 1, 7, and indeterminate, IME.

The 7 being for design. If there are more than 7 boxes on the whiteboard, try again.

[sargstuff]

ah, log base 2 of 7 is 127 bits (aka 8, y 1).

Unicode character can have more than 7 font boxes associated with one character box and still be a valid determinate character form.